MM-57378: Bump up golangci version (#26535)

https://mattermost.atlassian.net/browse/MM-57378
```release-note
NONE
```

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/config.go

@@ -4507,9 +4507,8 @@ func isSafeLink(link *string) bool {
 			return true
 		} else if strings.HasPrefix(*link, "/") {
 			return true
-		} else {
-			return false
 		}
+		return false
 	}
 
 	return true

server/public/model/user.go

@@ -750,9 +750,8 @@ func (u *User) GetFullName() string {
 		return u.FirstName
 	} else if u.LastName != "" {
 		return u.LastName
-	} else {
-		return ""
 	}
+	return ""
 }
 
 func (u *User) getDisplayName(baseName, nameFormat string) string {