test(debian+ubuntu): update `pkgrepo` to use `https` instead of `http`

```
$ GREP_SED="\(pkgrepo: deb http\):" \
  && grep -rl "${GREP_SED}" test/integration/v* \
     | xargs sed -i -e "/${GREP_SED}/s//\1s:/"
```

test/integration/v3000-py2/files/_mapdata/ubuntu-16.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/apt/ubuntu/16.04/amd64/3000 xenial main
+    pkgrepo: deb https://repo.saltstack.com/apt/ubuntu/16.04/amd64/3000 xenial main
     py_ver: ''
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3000-py2/files/_mapdata/ubuntu-18.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/apt/ubuntu/18.04/amd64/3000 bionic main
+    pkgrepo: deb https://repo.saltstack.com/apt/ubuntu/18.04/amd64/3000 bionic main
     py_ver: ''
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3000-py3/files/_mapdata/debian-10.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/debian/10/amd64/3000 buster main
+    pkgrepo: deb https://repo.saltstack.com/py3/debian/10/amd64/3000 buster main
     py_ver: py3
     pyinotify: python-pyinotify
     python_dulwich: python-dulwich

test/integration/v3000-py3/files/_mapdata/debian-9.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/debian/9/amd64/3000 stretch main
+    pkgrepo: deb https://repo.saltstack.com/py3/debian/9/amd64/3000 stretch main
     py_ver: py3
     pyinotify: python-pyinotify
     python_dulwich: python-dulwich

test/integration/v3000-py3/files/_mapdata/ubuntu-16.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/16.04/amd64/3000 xenial main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/16.04/amd64/3000 xenial main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3000-py3/files/_mapdata/ubuntu-18.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/18.04/amd64/3000 bionic main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/18.04/amd64/3000 bionic main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3001-py3/files/_mapdata/debian-10.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/debian/10/amd64/3001 buster main
+    pkgrepo: deb https://repo.saltstack.com/py3/debian/10/amd64/3001 buster main
     py_ver: py3
     pyinotify: python-pyinotify
     python_dulwich: python-dulwich

test/integration/v3001-py3/files/_mapdata/debian-9.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/debian/9/amd64/3001 stretch main
+    pkgrepo: deb https://repo.saltstack.com/py3/debian/9/amd64/3001 stretch main
     py_ver: py3
     pyinotify: python-pyinotify
     python_dulwich: python-dulwich

test/integration/v3001-py3/files/_mapdata/ubuntu-16.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/16.04/amd64/3001 xenial main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/16.04/amd64/3001 xenial main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3001-py3/files/_mapdata/ubuntu-18.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/18.04/amd64/3001 bionic main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/18.04/amd64/3001 bionic main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3001-py3/files/_mapdata/ubuntu-20.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/20.04/amd64/3001 focal main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/20.04/amd64/3001 focal main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3002-py3/files/_mapdata/debian-10.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/debian/10/amd64/3002 buster main
+    pkgrepo: deb https://repo.saltstack.com/py3/debian/10/amd64/3002 buster main
     py_ver: py3
     pyinotify: python-pyinotify
     python_dulwich: python-dulwich

test/integration/v3002-py3/files/_mapdata/debian-9.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/debian/9/amd64/3002 stretch main
+    pkgrepo: deb https://repo.saltstack.com/py3/debian/9/amd64/3002 stretch main
     py_ver: py3
     pyinotify: python-pyinotify
     python_dulwich: python-dulwich

test/integration/v3002-py3/files/_mapdata/ubuntu-16.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/16.04/amd64/3002 xenial main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/16.04/amd64/3002 xenial main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3002-py3/files/_mapdata/ubuntu-18.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/18.04/amd64/3002 bionic main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/18.04/amd64/3002 bionic main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify

test/integration/v3002-py3/files/_mapdata/ubuntu-20.yaml

       state: running
     parallel: true
     pin_version: false
-    pkgrepo: deb http://repo.saltstack.com/py3/ubuntu/20.04/amd64/3002 focal main
+    pkgrepo: deb https://repo.saltstack.com/py3/ubuntu/20.04/amd64/3002 focal main
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify