Bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/phar_build_and_update.yml

@@ -36,7 +36,7 @@ jobs:
         run: |
           echo "::set-output name=dir::$(composer config cache-files-dir)"
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}

.github/workflows/test-magento-open-source.yml

@@ -30,7 +30,7 @@ jobs:
           coverage: none
 
       - name: Cache dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cache/composer

.github/workflows/test-openmage-20.0.yml

@@ -37,7 +37,7 @@ jobs:
           coverage: none
 
       - name: Cache dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cache/composer

.github/workflows/test-openmage-20.1.yml

@@ -40,7 +40,7 @@ jobs:
           coverage: none
 
       - name: Cache dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cache/composer