fixup go-verdiff job (#1660)

Signed-off-by: Per Goncalves da Silva <[email protected]>
Co-authored-by: Per Goncalves da Silva <[email protected]>
Upstream-repository: operator-registry
Upstream-commit: d32817b494ede047cf58d78f97d9e3fe7dc28c63

Author: 2 people

staging/operator-registry/.github/workflows/go-verdiff.yaml

@@ -5,7 +5,7 @@ on:
       - '**.mod'
       - '.github/workflows/go-verdiff.yaml'
     branches:
-      - main
+      - master
 jobs:
   go-verdiff:
     runs-on: ubuntu-latest