Revert "Enable gradle setup step for all Java versions."

This reverts commit 6fba9e3.

Author: phipag

.github/workflows/pr_iac_lint.yml

@@ -29,6 +29,7 @@ jobs:
           distribution: 'corretto'
           java-version: 11
       - name: Build Gradle Setup
+        if: ${{ matrix.java == '8' }} # Gradle example can only be built on Java 8
         working-directory: examples/powertools-examples-core/gradle
         run: |
           curl -L -o gradle/wrapper/gradle.zip https:$(cat gradle/wrapper/gradle-wrapper.properties  | grep distributionUrl | cut -d ':' -f 2)