fix(core): dispose invalid repositories before removing them

Author: jonisavo

Packages/io.savolainen.unitygit/Core/Services/StatusService.cs

@@ -88,7 +88,10 @@ private void RemoveInvalidRepositories(IList<IRepository> repositories)
             }
 
             foreach (var index in indexesToRemove)
+            {
+                repositories[index].Dispose();
                 repositories.RemoveAt(index);
+            }
         }
     }