ci: Use meltano/commitizen-version-bump (meltano#6665)

* ci: Use `meltano/commitizen-version-bump`

To customize how Commitizen performs our version bump, Meltano and the SDK will now use https://github.com/meltano/commitizen-version-bump. It will be installed and used by `commitizen-action` in the `version_bump` GitHub workflow.

* Add `commitizen-version-bump` to dev deps

.github/workflows/version_bump.yml

@@ -54,6 +54,7 @@ jobs:
         push: "false"
         changelog: "true"
         github_token: ${{ secrets.GITHUB_TOKEN }}
+        extra_requirements: 'git+https://github.com/meltano/commitizen-version-bump@main'
         changelog_increment_filename: _changelog_fragment.md
 
     - env: