build(deps): bump whelk-io/maven-settings-xml-action from 20 to 21 (#225)

Bumps [whelk-io/maven-settings-xml-action](https://github.com/whelk-io/maven-settings-xml-action) from 20 to 21.
- [Release notes](https://github.com/whelk-io/maven-settings-xml-action/releases)
- [Commits](whelk-io/maven-settings-xml-action@v20...v21)

---
updated-dependencies:
- dependency-name: whelk-io/maven-settings-xml-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/automate_javadoc.yml

@@ -24,7 +24,7 @@ jobs:
           ref: ${{ env.target_branch }}
 
       - name: Create custom Maven Settings.xml
-        uses: whelk-io/maven-settings-xml-action@v20
+        uses: whelk-io/maven-settings-xml-action@v21
         with:
           output_file: custom_maven_settings.xml
           servers: '[{ "id": "github-packages-compas", "username": "OWNER", "password": "${{ secrets.GITHUB_TOKEN }}" }]'