Merge pull request #134 from alecpl/dev/ci

CI: Enable testing for PHP 8.1, 8.2, 8.3

.github/workflows/build.yml

@@ -11,13 +11,13 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ ubuntu-latest ]
-        php: [ '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0' ]
+        php: [ '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]
         dependencies: [ 'locked' ]
 
     name: PHP ${{ matrix.php }} on ${{ matrix.operating-system }} with ${{ matrix.dependencies }} dependencies
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         name: Checkout repository
 
       - name: Setup PHP