Don't deploy docs on merge queue

Author: benjeffery

.github/workflows/docs.yml

@@ -51,7 +51,7 @@ jobs:
 
   deploy:
     needs: build-docs
-    if: github.event_name != 'pull_request'
+    if: github.event_name != 'pull_request' && github.event_name != 'merge_group'
     permissions:
         pages: write
         id-token: write