(split from main repo) chore: Correct namespace

Author: RussKie

FormGerritPublish.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using System.Windows.Forms;
 using GitCommands;
+using GitExtUtils;
 using GitUI.Properties;
 using GitUIPluginInterfaces;
 using JetBrains.Annotations;

GerritUtil.cs

@@ -5,6 +5,7 @@
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using GitCommands;
+using GitExtUtils;
 using GitUI;
 using GitUIPluginInterfaces;
 using JetBrains.Annotations;