Fix DCO action

Signed-off-by: Dan Lynn <dan.lynn@fivetran.com>

Author: Dan Lynn

.github/workflows/dco.yml

@@ -9,4 +9,4 @@ jobs:
     name: DCO Check
     runs-on: ubuntu-latest
     steps:
-      - uses: tim-actions/dco@master
+      - uses: tim-actions/dco@main