Bump metcalfc/changelog-generator in /.github/workflows

Bumps [metcalfc/changelog-generator](https://github.com/metcalfc/changelog-generator) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/metcalfc/changelog-generator/releases)
- [Changelog](https://github.com/metcalfc/changelog-generator/blob/main/release-notes.png)
- [Commits](metcalfc/changelog-generator@v4.1.0...v4.2.0)

---
updated-dependencies:
- dependency-name: metcalfc/changelog-generator
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/generate_changelog.yml

@@ -22,7 +22,7 @@ jobs:
 
       - name: Generate changelog
         id: changelog
-        uses: metcalfc/changelog-generator@v4.1.0
+        uses: metcalfc/changelog-generator@v4.2.0
         with:
           myToken: ${{ secrets.GITHUB_TOKEN }}
           head-ref: ${{ github.event.inputs.head-ref }}