chore: test in java 17 and 21

.github/workflows/checks.yaml

@@ -24,18 +24,24 @@ jobs:
         with:
           api-key: ${{ secrets.FOSSA_API_KEY }}
           run-tests: true
-  build:
+
+  test:
     name: Run Checks
     runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java: [17, 21]
+
     steps:
       - name: Checkout the source
-        uses: actions/checkout@v4
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@v2
-      - name: Set up JDK 17
-        uses: actions/setup-java@v4
+        uses: gradle/wrapper-validation-action@b231772637bb498f11fdbc86052b6e8a8dc9fc92 # v2.1.2
+      - name: Set up JDK
+        uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 # v4.2.1
         with:
-          java-version: "17"
+          java-version: ${{ matrix.java }}
           distribution: "temurin"
       - name: Run Gradle check task
         run: ./gradlew check --continue