dependabot.yaml: link to the upstream file was broken

Cf. cert-manager/makefile-modules#196

Author: maelvls

.github/dependabot.yaml

@@ -1,5 +1,5 @@
 # THIS FILE IS AUTOMATICALLY GENERATED. DO NOT EDIT.
-# Edit https://github.com/cert-manager/makefile-modules/blob/main/modules/repository-base/base/.github/dependabot.yaml instead.
+# Edit https://github.com/cert-manager/makefile-modules/blob/main/modules/repository-base/base-dependabot/.github/dependabot.yaml instead.
 
 # Update Go dependencies and GitHub Actions dependencies daily.
 version: 2