chore(semantic-release): replace broken `m2r` with `m2r2` [skip ci]

* Automated using https://github.com/myii/ssf-formula/pull/404

pre-commit_semantic-release.sh

 
 
 ###############################################################################
-# (B) Use `m2r` to convert automatically produced `.md` docs to `.rst`
+# (B) Use `m2r2` to convert automatically produced `.md` docs to `.rst`
 ###############################################################################
 
-# Install `m2r`
-pip3 install m2r
+# Install `m2r2`
+pip3 install m2r2
 
 # Copy and then convert the `.md` docs
 cp ./*.md docs/
 cd docs/ || exit
-m2r --overwrite ./*.md
+m2r2 --overwrite ./*.md
 
 # Change excess `H1` headings to `H2` in converted `CHANGELOG.rst`
 sed -i -e '/^=.*$/s/=/-/g' CHANGELOG.rst