Merge pull request #6 from ItinerisLtd/github/actions/update-workflows

Update GitHub Actions workflows to version `v4`

Author: codepuncher

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
         id: composercache
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: ${{ steps.composercache.outputs.dir }}
           key: ${{ runner.os }}-${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}