update actions/cache to v4

Author: remyperona

.github/workflows/code_coverage.yml

@@ -51,7 +51,7 @@ jobs:
       run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
     - name: Cache dependencies
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ steps.composercache.outputs.dir }}
         key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}

.github/workflows/test.yml

@@ -56,7 +56,7 @@ jobs:
               run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
             - name: Cache dependencies
-              uses: actions/cache@v2
+              uses: actions/cache@v4
               with:
                   path: ${{ steps.composercache.outputs.dir }}
                   key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}