chore: drop GO_VERSION from Docker image tags

If a Kapow! release is rebuilt against a new Go, the Kapow! release
should get a minor release bump.

Co-authored-by: Roberto Abdelkader Martínez Pérez <robertomartinezp@gmail.com>

.goreleaser.yml

@@ -54,7 +54,6 @@ dockers:
     image_templates:
       - "bbvalabsci/kapow:latest"
       - "bbvalabsci/kapow:{{ .Tag }}"
-      - "bbvalabsci/kapow:{{ .Tag }}-{{ .Env.GO_VERSION }}"
       - "bbvalabsci/kapow:v{{ .Major }}"
 
 release: