Bump actions/setup-java from 2.3.0 to 2.3.1

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@v2.3.0...v2.3.1)

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

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

.github/workflows/maven.yml

@@ -35,7 +35,7 @@ jobs:
         uses: actions/checkout@v2.3.4
 
       - name: Set up JDK
-        uses: actions/setup-java@v2.3.0
+        uses: actions/setup-java@v2.3.1
         with:
           cache: 'maven'
           java-version: ${{ matrix.java }}