Run CI coding standards on PHP 8.5

Adds PHP 8.5 to the lint matrix and switches the coding standards job/cache key from PHP 8.1 to PHP 8.5.

.gitea/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['7.4', '8.1']
+        php-version: ['7.4', '8.1', '8.5']
     steps:
       - uses: actions/checkout@v4
       - uses: shivammathur/setup-php@v2
@@ -26,11 +26,11 @@ jobs:
       - uses: actions/checkout@v4
       - uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '8.5'
       - uses: actions/cache@v4
         with:
           path: vendor
-          key: php-8.1-${{ hashFiles('composer.lock') }}
+          key: php-8.5-${{ hashFiles('composer.lock') }}
       - name: Install dependencies
         run: composer install --no-interaction --no-progress --prefer-dist
       - name: Run PHP-CS-Fixer