chore: use checkout@v6, add PHP 8.5, allow PHPUnit 12

Author: alies-dev

.github/workflows/bc-check.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/psalm.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/tests.yml

@@ -12,12 +12,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ['8.2', '8.3', '8.4']
+        php: ['8.2', '8.3', '8.4', '8.5']
 
     name: PHP ${{ matrix.php }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

composer.json

@@ -26,7 +26,7 @@
         "php-http/discovery": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^11.0",
+        "phpunit/phpunit": "^11.0 || ^12.0",
         "php-http/mock-client": "^1.0",
         "php-http/message": "^1.7",
         "nyholm/psr7": "^1.0",