Fix pr workflow

- Use corret jdk
- Relates #407

Author: jvalkeal

.github/workflows/ci-pr.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/setup-java@v2
         with:
           distribution: adopt
-          java-version: 8
+          java-version: ${{ matrix.java }}
       - name: Build
         env:
           DISABLE_SAMPLES: ${{ matrix.disable-samples }}