add test/build support for php8.3

Author: DavidGoodwin

.github/workflows/php.yml

@@ -72,7 +72,7 @@ jobs:
           - 11211:11211
     strategy:
       matrix:
-        php-versions: [ '7.4', '8.0', '8.1', '8.2' ]
+        php-versions: [ '7.4', '8.0', '8.1', '8.2', '8.3' ]
 
     steps: