Upgrade GH workflows with JDK 8
diff --git a/.github/workflows/pr-validation.yml b/.github/workflows/pr-validation.yml
index 286d0cc..0eb0c6e 100644
--- a/.github/workflows/pr-validation.yml
+++ b/.github/workflows/pr-validation.yml
@@ -26,7 +26,7 @@
         uses: actions/setup-java@v3
         with:
           distribution: 'zulu'
-          java-version: 1.8
+          java-version: 8
       - name: 'Cache Maven packages'
         uses: actions/cache@v3
         with: