Bump cobot branch name

.github/workflows/continuous-integration.yml

@@ -49,7 +49,7 @@ jobs:
       - name: Run CouchDB
         timeout-minutes: 3
         continue-on-error: true
-        uses: cobot/couchdb-action@eaaa17cf8baf421e7fb07e2d869f5457bb6a4de5 # master
+        uses: cobot/couchdb-action@eaaa17cf8baf421e7fb07e2d869f5457bb6a4de5 # main
         with:
           couchdb version: '2.3.1'