Update DetectVersionService.cs (#1684)

* Update DetectVersionService.cs

The package search will search the winget repository and will always return the newest version. Package.Version and Package.AvailableVersion will always be the same here.
I changed it to `GetInstalledPackages(packageId)` instead of `SearchPackage(PackageId)`. This will give you the correct installed and available version and should also be faster, because you are just going through the installed packages.

* Update DetectVersionService.cs

---------

Co-authored-by: Martin Hinshelwood nkdAgility.com <martin@nkdagility.com>

src/MigrationTools.Host/Services/DetectVersionService.cs

@@ -37,7 +37,7 @@ public Version GetLatestVersion()
  try
  {
  WinGetPackageManager packageManager = new WinGetPackageManager();
- var package = packageManager.SearchPackage(PackageId).SingleOrDefault();
+ var package = packageManager.GetInstalledPackages(PackageId).GroupBy(e => e.Id, (id, g) => g.First()).SingleOrDefault();
 
  latestPackageVersion = new Version(package.AvailableVersion);
  if (latestPackageVersion != null)
@@ -57,4 +57,4 @@ public Version GetLatestVersion()
  return latestPackageVersion;
  }
  }
-}
+}