Bump actions/setup-java from 1 to 2.1.0

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 1 to 2.1.0.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@v1...v2.1.0)

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

.github/workflows/maven.yml

@@ -44,7 +44,7 @@ jobs:
             maven-${{ matrix.os }}-
 
       - name: Set up JDK
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2.1.0
         with:
           java-version: ${{ matrix.java }}