Bump actions/setup-java from 3 to 4

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 3 to 4.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-java
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/mend.yml

@@ -21,7 +21,7 @@ jobs:
     - name: check lock
       run: '[ -f "Gemfile.lock" ] && echo "package lock file exists, skipping" || bundle lock'
     # install java
-    - uses: actions/setup-java@v3
+    - uses: actions/setup-java@v4
       with:
         distribution: 'temurin' # See 'Supported distributions' for available options
         java-version: '17'