feat(ci): add php 8.3 to test (#383)

Author: Rotzbua

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: ['8.0', '8.1', '8.2']
+        php: ['8.0', '8.1', '8.2', '8.3']
         ext: ['curl, mbstring, openssl', 'curl, mbstring, openssl, gmp']
 
     name: PHP ${{ matrix.php }} (${{ matrix.ext }})