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>

app/slashcommands/command_test.go

@@ -173,6 +173,7 @@ func TestHandleCommandResponsePost(t *testing.T) {
 	// Command is not built in, so it is a bot command.
 	builtIn = false
 	post, err = th.App.HandleCommandResponsePost(command, args, resp, builtIn)
+	assert.Nil(t, err)
 	assert.Equal(t, "true", post.GetProp("from_webhook"))
 
 	builtIn = true