Update actions/cache action to v4

| datasource  | package       | from | to |
| ----------- | ------------- | ---- | -- |
| github-tags | actions/cache | v3   | v4 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/format_php.yml

@@ -30,7 +30,7 @@ jobs:
           echo "composer_dir={$(composer config cache-files-dir)}" >> $GITHUB_OUTPUT
 
       - name: Retrieve Composer‘s cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.composer_dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
@@ -41,7 +41,7 @@ jobs:
         run: "composer install --no-interaction --no-progress --no-scripts"
 
       - name: Retrieve PHPCS‘s cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: .cache/phpcs
           key: ${{ runner.os }}-phpcs-${{ hashFiles('phpcs.xml') }}

.github/workflows/psalm.yml

@@ -33,7 +33,7 @@ jobs:
           echo "composer_dir={$(composer config cache-files-dir)}" >> $GITHUB_OUTPUT
 
       - name: Retrieve Composer‘s cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.composer_dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
@@ -46,7 +46,7 @@ jobs:
       # the way cache keys are set up will always cause a cache miss
       # but will restore the cache generated during the previous run based on partial match
       - name: Retrieve Psalm’s cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ./cache/psalm
           key: ${{ runner.os }}-psalm-cache-${{ hashFiles('psalm.xml', 'psalm-baseline.xml') }}

.github/workflows/validator.yml

@@ -29,7 +29,7 @@ jobs:
           echo "composer_dir={$(composer config cache-files-dir)}" >> $GITHUB_OUTPUT
 
       - name: Retrieve Composer‘s cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.composer_dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}