Update CI

Author: malberts

.github/workflows/ci.yml

@@ -23,10 +23,13 @@ jobs:
             experimental: false
           - mw: 'REL1_41'
             php: 8.1
-            experimental: true
+            experimental: false
           - mw: 'REL1_42'
             php: 8.2
             experimental: true
+          - mw: 'master'
+            php: 8.3
+            experimental: true
 
     runs-on: ubuntu-latest