ci: add tests for PHP 8.5 (and fix ci) (#273)

* ci: add tests for PHP 8.5

upgrade actions/chechkout 4 => 5

* Update PHP test runner to Ubuntu 22.04

Author: Chris53897

.github/workflows/test.yaml

@@ -6,7 +6,7 @@ jobs:
     test:
         name: PHP ${{ matrix.php-version }}
 
-        runs-on: ubuntu-20.04
+        runs-on: ubuntu-22.04
 
         strategy:
             matrix:
@@ -16,11 +16,12 @@ jobs:
                     - 8.2
                     - 8.3
                     - 8.4
+                    - 8.5
                 dependencies: [highest]
 
         steps:
             - name: Checkout
-              uses: actions/checkout@v4
+              uses: actions/checkout@v5
 
             - name: Install PHP with extensions
               uses: shivammathur/setup-php@v2