fixup go-verdiff job

Signed-off-by: Per Goncalves da Silva <pegoncal@redhat.com>

Author: Per Goncalves da Silva

.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