fix copy action

Author: rustagir

.github/workflows/copy-compat-to-docs-shared.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch: {} # use to manually trigger workflow
   push:
     branches:
-      - "master"
+      - "main"
     paths:
       - "source/includes/mongodb-compatibility-table-java-rs.rst"
       - "source/includes/language-compatibility-table-java-rs.rst"