chore(deps): update dependency microsoft.windows.sdk.buildtools to 10.0.28000.1839 (#4346)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [Microsoft.Windows.SDK.BuildTools](https://aka.ms/WinSDKProjectURL) |
`10.0.28000.1721` → `10.0.28000.1839` |
![age](https://developer.mend.io/api/mc/badges/age/nuget/Microsoft.Windows.SDK.BuildTools/10.0.28000.1839?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/Microsoft.Windows.SDK.BuildTools/10.0.28000.1721/10.0.28000.1839?slim=true)
|

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/reactiveui/ReactiveUI).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xNTkuMiIsInVwZGF0ZWRJblZlciI6IjQzLjE1OS4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJEZXBlbmRlbmN5IE1hbmFnZW1lbnQiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Directory.Packages.props

@@ -34,7 +34,7 @@
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.1.0" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.203" />
-    <PackageVersion Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.28000.1721" />
+    <PackageVersion Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.28000.1839" />
     <PackageVersion Include="Microsoft.Xaml.Behaviors.Wpf" Version="$(XamlBehaviorsWpfVersion)" />
     <PackageVersion Include="Mocks.Maui" Version="1.2.5" />
     <PackageVersion Include="Nerdbank.GitVersioning" Version="3.9.50" />