update gha cache version

Author: wenxi-zeng

.github/workflows/build.yml

@@ -27,7 +27,7 @@ jobs:
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     - name: cache gradle dependencies
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: cache gradle dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: |
             ~/.gradle/caches

.github/workflows/snapshot.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: cache gradle dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: |
             ~/.gradle/caches