ci: fix goreleaser ko config (#1056)

We accidentally used the `bare` and `base_import_paths` option at the
same time, which disabled the `bare` option. This added extra nesting
after `KO_DOCKER_REPO`, causing the push to Docker Hub to fail.

Author: phm07

.goreleaser.yml

@@ -44,7 +44,6 @@ kos:
     platforms:
       - linux/amd64
       - linux/arm64
-    base_import_paths: true
     base_image: alpine
     bare: true
     labels: