Add PHP 8.3 to Github actions.

Author: markrogoyski

.github/workflows/test_other_branches.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: ['7.4', '8.0', '8.1', '8.2']
+        php: ['7.4', '8.0', '8.1', '8.2', '8.3']
 
     steps:
       - name: Set up PHP