chore(github-actions): pin dependency java-jdk to 21.0.12+8.0.lts (#93)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Set up Java
         uses: actions/setup-java@v6.0.1
         with:
-          java-version: "21"
+          java-version: "21.0.12+8.0.LTS"
           distribution: "temurin"
       - name: Build
         run: ./gradlew clean build