GH Actions: update PHP versions in workflows

PHP 8.2 has been released today 🎉 and the `setup-php` action has announced support for PHP 8.3, so adding PHP 8.3 to the matrix.

Note: PHPCS does not (yet) have full syntax support for PHP 8.2, but it does have runtime support (for the most part, see squizlabs/PHP_CodeSniffer 3629).

Builds against PHP 8.3 are still allowed to fail for now.

Author: jrfnl

.github/workflows/unit-tests.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [ '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2' ]
+        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' ]
         phpcs_version: [ '3.7.1', 'dev-master' ]
         #include:
           # Add extra build to test against PHPCS 4.
@@ -30,6 +30,8 @@ jobs:
 
     name: PHP ${{ matrix.php }} on PHPCS ${{ matrix.phpcs_version }}
 
+    continue-on-error: ${{ matrix.php == '8.3' }}
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3