Run tests on PHP 8.3

Author: dmason30

.github/workflows/run-tests.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest]
-        php: ['8.2', '8.1', '8.0']
+        php: ['8.3', '8.2', '8.1', '8.0']
         laravel: [^8.0, ^9.0, ^10.0]
         dependency-version: [prefer-lowest, prefer-stable]
         exclude: