Bump actions/setup-java from 1 to 2.5.0

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 1 to 2.5.0.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](https://github.com/actions/setup-java/compare/v1...v2.5.0)

---
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/dart.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-java@v1
+      - uses: actions/setup-java@v2.5.0
         with:
           java-version: '12.x'
       - uses: subosito/flutter-action@v2.3.0