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](https://github.com/actions/setup-java/compare/v1...v2.1.0)

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

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

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Set up JDK 8
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2.1.0
         with:
           java-version: 8
 

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
           git config user.name  'github-actions[bot]'
           
       - name: Setup Java
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2.1.0
         with:
           java-version: 8