Run levels tests on 8.3

Author: ondrejmirtes

.github/workflows/tests.yml

@@ -146,7 +146,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          php-version: "8.1"
+          php-version: "8.3"
           tools: pecl
           extensions: ds,mbstring
           ini-file: development