MarkdownTextBlock crash fix (#42171)

## Summary of the Pull Request

Bumping MarkdownTextBlock to `0.1.251002-build.2316` that includes the
fix for this crashing bug.

cc @jiripolasek it seems to work?

<img width="831" height="508" alt="image"
src="https://github.com/user-attachments/assets/1b53144c-516f-4df9-b47d-0d4e80dbe1a2"
/>

## PR Checklist

- [x] Closes: #42142
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

Directory.Packages.props

@@ -22,7 +22,7 @@
     <PackageVersion Include="CommunityToolkit.WinUI.Converters" Version="8.2.250402" />
     <PackageVersion Include="CommunityToolkit.WinUI.Extensions" Version="8.2.250402" />
     <PackageVersion Include="CommunityToolkit.WinUI.UI.Controls.DataGrid" Version="7.1.2" />
-    <PackageVersion Include="CommunityToolkit.Labs.WinUI.Controls.MarkdownTextBlock" Version="0.1.250910-build.2249" />
+    <PackageVersion Include="CommunityToolkit.Labs.WinUI.Controls.MarkdownTextBlock" Version="0.1.251002-build.2316" />
     <PackageVersion Include="ControlzEx" Version="6.0.0" />
     <PackageVersion Include="HelixToolkit" Version="2.24.0" />
     <PackageVersion Include="HelixToolkit.Core.Wpf" Version="2.24.0" />

src/settings-ui/Settings.UI/SettingsXAML/OOBE/Views/OobeWhatsNew.xaml

@@ -20,8 +20,7 @@
             H2Margin="0, 16, 0, 4"
             H3FontSize="16"
             H3FontWeight="SemiBold"
-            H3Margin="0, 16, 0, 4"
-            HeadingForeground="{StaticResource TextFillColorPrimaryBrush}" />
+            H3Margin="0, 16, 0, 4" />
         <tkcontrols:MarkdownConfig x:Key="ReleaseNotesMarkdownConfig" Themes="{StaticResource ReleaseNotesMarkdownThemeConfig}" />
     </Page.Resources>