Enable PHP 8.4 in build matrix and update PHPStan to use PHP 8.3

Co-authored-by: lisachenko <[email protected]>

Author: Copilot

.github/workflows/phpstan.yml

@@ -13,7 +13,7 @@ jobs:
       - name: "Install PHP"
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "8.2"
+          php-version: "8.3"
           ini-values: memory_limit=-1
           tools: composer:v2
       - name: "Cache dependencies"
@@ -22,8 +22,8 @@ jobs:
           path: |
             ~/.composer/cache
             vendor
-          key: "php-8.2"
-          restore-keys: "php-8.2"
+          key: "php-8.3"
+          restore-keys: "php-8.3"
       - name: "Install dependencies"
         run: "composer install --no-interaction --no-progress --no-suggest"
       - name: "Static analysis"

.github/workflows/phpunit.yml

@@ -18,6 +18,7 @@ jobs:
         php-version:
           - "8.2"
           - "8.3"
+          - "8.4"
         operating-system:
           - "ubuntu-latest"