Add a CI job running on PHP 8.5

This also updates actions used in the CI setup to use the latest
version.

Author: stof

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
         name: Check composer.json
         runs-on: ubuntu-latest
         steps:
-            -   uses: actions/checkout@v4
+            -   uses: actions/checkout@v5
             -   uses: shivammathur/setup-php@v2
                 with:
                     coverage: none
@@ -25,7 +25,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: [ '8.1', '8.2', '8.3', '8.4' ]
+                php: [ '8.1', '8.2', '8.3', '8.4', '8.5' ]
                 os: [ubuntu-latest]
                 include:
                     - php: '8.3'
@@ -40,7 +40,7 @@ jobs:
                 run: git config --global core.autocrlf false
 
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v5
 
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
@@ -61,7 +61,7 @@ jobs:
 
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v5
 
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
@@ -82,7 +82,7 @@ jobs:
 
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v5
 
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2