chore(github-actions): pin dependency java-jdk to 21.0.12+8.0.lts

Author: renovate[bot]

.github/workflows/build.yml

@@ -49,7 +49,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v6.0.1
         with:
-          java-version: "21"
+          java-version: "21.0.12+8.0.LTS"
           distribution: "temurin"
       - name: Build and run tests
         run: mvn clean verify

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/setup-java@v6.0.1
         with:
           distribution: "temurin"
-          java-version: "21"
+          java-version: "21.0.12+8.0.LTS"
 
       - name: Run linting
         run: mvn clean validate