Update GH Actions

Author: irazasyed

.github/workflows/phpstan.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '8.2'
           coverage: none
 
       - name: Install composer dependencies

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [8.1, '8.2']
+        php: ['8.1', '8.2', '8.3']
         dependencies: [lowest, highest]
         experimental: [false]