chore(CI): update to actions/cache@v4

Author: rholshausen

.github/workflows/gradle.yml

@@ -21,7 +21,7 @@ jobs:
         distribution: temurin
         java-version: 18
     - name: Cache Gradle packages
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.gradle/caches
         key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
@@ -44,7 +44,7 @@ jobs:
           distribution: temurin
           java-version: ${{ matrix.jdk }}
       - name: Cache Gradle packages
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}