Bump golangci version to v1.38.0 (#17154)

* Update golangci to v1.38.0

Co-authored-by: Claudio Costa <cstcld91@gmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

.gitlab-ci.yml

@@ -22,7 +22,7 @@ empty:
     - echo "empty"
 
 #lint:
-#  image: $CI_REGISTRY/mattermost/ci/images/golangci-lint:v1.33.2-1
+#  image: $CI_REGISTRY/mattermost/ci/images/golangci-lint:v1.38.0
 #  stage: .pre
 #  script:
 #    - GO111MODULE=off GOBIN=$PWD/bin go get -u github.com/mattermost/mattermost-govet