Fix CI workflow: Update Gradle wrapper to use matrix versions

- Add step to update gradle-wrapper.properties to the matrix Gradle version
- This ensures tests actually run with the specified Gradle versions (8.3, 8.14.3, 9.2.1)
- Previously gradlew was using the fixed wrapper version instead of matrix versions
- Update cache key to include Gradle version for better cache isolation

Author: gamma

.github/workflows/ci.yml

@@ -40,10 +40,14 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          key: ${{ runner.os }}-gradle-${{ matrix.gradle-version }}-${{ hashFiles('**/*.gradle*') }}
           restore-keys: |
+            ${{ runner.os }}-gradle-${{ matrix.gradle-version }}-
             ${{ runner.os }}-gradle-
       
+      - name: Update Gradle wrapper to ${{ matrix.gradle-version }}
+        run: ./gradlew wrapper --gradle-version ${{ matrix.gradle-version }} --no-daemon
+      
       - name: Run tests with Gradle ${{ matrix.gradle-version }}
         run: ./gradlew clean test --no-daemon