Set base for golanci-lint update PR

We cannot run this on PRs since that would require more privileges. We can still manually trigger it to run on a specific branch as a way of testing
the workflow.
Also fix the syntax for add-paths. It should be a comma or newline separated list of paths, but we had an extra "-" in front of the path.

Signed-off-by: Lennart Jern <[email protected]>

Author: lentzi90

.github/workflows/update-golangci-lint.yaml

@@ -48,6 +48,7 @@ jobs:
             This PR was generated by GH workflow `update-golangci-lint` and
             updates golangci-lint to version v${{ steps.get_version.outputs.latest_version }}.
           branch: update-golangci-lint-${{ steps.get_version.outputs.latest_version }}
+          base: main
           labels: "area/dependency"
           add-paths: |
-            - hack/tools/Makefile
+            hack/tools/Makefile