add WordPress 6.1 to test matrix

Author: tschortsch

.github/workflows/lint-test-deploy.yml

@@ -36,7 +36,7 @@ jobs:
 
     strategy:
       matrix:
-        wp: [ '5.7', '5.8', '5.9', '6.0' ]
+        wp: [ '5.7', '5.8', '5.9', '6.0', '6.1' ]
 
     steps:
       - uses: actions/checkout@v3