Update cache action in workflows

Author: stefan-ka

.github/workflows/build_master.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Install Graphviz
       run: sudo apt-get -y install graphviz
     - name: Gradle caches
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches

.github/workflows/build_standard.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Install Graphviz
       run: sudo apt-get -y install graphviz
     - name: Gradle caches
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Install Graphviz
       run: sudo apt-get -y install graphviz
     - name: Gradle caches
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           ~/.gradle/caches