attempt to make integration tests work

Author: TheSnoozer

.github/workflows/default-tests.yml

@@ -120,6 +120,15 @@ jobs:
           distribution: 'zulu'
           java-version: ${{ matrix.java_version }}
           java-package: jdk
+      - name: Downgrade gradle wrapper
+        # Gradle 8.14.4 only supports up to Java 23
+        # Java 26 (major version 70) requires Gradle 9.4+
+        run: |
+          if [ "${{ matrix.java_version }}" -ge 24 ]; then
+            sed -i 's/gradle-[0-9.]*-\(bin\|all\)\.zip/gradle-9.4.0-\1.zip/' gradle/wrapper/gradle-wrapper.properties
+          else
+            sed -i 's/gradle-[0-9.]*-\(bin\|all\)\.zip/gradle-8.14.4-\1.zip/' gradle/wrapper/gradle-wrapper.properties
+          fi
       - name: Install a test version with Gradle
         run: ./gradlew clean publishAllPublicationsToLocalPluginRepositoryRepository
       - name: Setup TEMP_DIR