don't fetch, with act, locally we don't have access to the git ssh key

.github/workflows/lint-license.yaml

@@ -12,9 +12,5 @@ jobs:
       - name: Check out the project
         uses: actions/checkout@v4
 
-      # This is so `make license` doesn't say "bad revision origin/main"
-      - name: Fetch origin for diff
-        run: git fetch origin
-
       - name: Check license headers
         run: make license