Remove golint as linter

- Partialy resolvess go-gitea#17596
- In the newer versions of `golangci-lint`, golint is  deprecated and
replaced by the `revive` linter. Thus removing the `golint` linter is a
good idea, as we're already using the `revive` linter which covers all
the current `golint` cases.

.golangci.yml

@@ -9,7 +9,6 @@ linters:
     - unused
     - structcheck
     - varcheck
-    - golint
     - dupl
     #- gocyclo # The cyclomatic complexety of a lot of functions is too high, we should refactor those another time.
     - gofmt