Update workflow actions/cache

Author: stefan-ka

.github/workflows/build_master.yml

@@ -20,7 +20,7 @@ jobs:
       with:
         java-version: 17
     - name: Gradle caches
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches

.github/workflows/build_standard.yml

@@ -19,7 +19,7 @@ jobs:
       with:
         java-version: 17
     - name: Gradle caches  
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
       with:
         java-version: 17
     - name: Gradle caches  
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches