test(_mapdata): use `15.3` for `opensuse-15.yaml`

test/integration/v3003-py3/files/_mapdata/opensuse-15.yaml

@@ -42,7 +42,7 @@ values:
           version: 0.23.0
         version: 0.23.0
     install_packages: true
-    key_url: https://download.opensuse.org/repositories/systemsmanagement:/saltstack/openSUSE_Leap_15.2/repodata/repomd.xml.key
+    key_url: https://download.opensuse.org/repositories/systemsmanagement:/saltstack/openSUSE_Leap_15.3/repodata/repomd.xml.key
     master:
       ext_pillar:
       - cmd_yaml: cat /etc/salt/yaml
@@ -85,8 +85,8 @@ values:
       state: running
     parallel: true
     pin_version: false
-    pkgrepo: https://download.opensuse.org/repositories/systemsmanagement:/saltstack/openSUSE_Leap_15.2/
-    pkgrepo_humanname: Salt releases for SLE-based SUSE products (openSUSE_Leap_15.2)
+    pkgrepo: https://download.opensuse.org/repositories/systemsmanagement:/saltstack/openSUSE_Leap_15.3/
+    pkgrepo_humanname: Salt releases for SLE-based SUSE products (openSUSE_Leap_15.3)
     py_ver: py3
     pygit2: python-pygit2
     pyinotify: python-pyinotify