run build on java 11 and 17

Author: otter606

.github/workflows/prs.yml

@@ -7,11 +7,14 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ '8', '11' ]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
         with:
           distribution: 'corretto'
-          java-version: '8'
+          java-version: ${{matrix.java}}
           cache: 'gradle'
-      - run: ./gradlew test --no-daemon
+      - run: ./gradlew test --no-daemon