Bump actions/setup-java from 2.3.1 to 2.4.0 (#228)

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 2.3.1 to 2.4.0.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@v2.3.1...v2.4.0)

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

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

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

.github/workflows/maven.yml

@@ -31,7 +31,7 @@ jobs:
             maven-${{ matrix.os }}-
 
       - name: Set up JDK
-        uses: actions/setup-java@v2.3.1
+        uses: actions/setup-java@v2.4.0
         with:
           distribution: adopt
           java-version: ${{ matrix.java }}