test: php 8.3 (#177)

* test: php 8.3

* update phpspec/prophecy to 1.18.0

Author: bytestream

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
         strategy:
             fail-fast: true
             matrix:
-                php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
+                php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
                 stability: [prefer-stable]
 
         name: PHP ${{ matrix.php }} - ${{ matrix.stability }}