build(deps): bump Microsoft.WindowsAppSDK in /src (#3447)

Bumps [Microsoft.WindowsAppSDK](https://github.com/microsoft/windowsappsdk) from 1.2.221116.1 to 1.2.221209.1.
- [Release notes](https://github.com/microsoft/windowsappsdk/releases)
- [Commits](https://github.com/microsoft/windowsappsdk/commits)

---
updated-dependencies:
- dependency-name: Microsoft.WindowsAppSDK
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/ReactiveUI.Maui/ReactiveUI.Maui.csproj

@@ -16,7 +16,7 @@
 	</PropertyGroup>
 
 	<ItemGroup Condition="$(TargetFramework.StartsWith('net6.0-windows10')) or $(TargetFramework.StartsWith('net7.0-windows10'))">
-		<PackageReference Include="Microsoft.WindowsAppSDK" Version="1.2.221116.1" />
+		<PackageReference Include="Microsoft.WindowsAppSDK" Version="1.2.221209.1" />
 	</ItemGroup>
   <ItemGroup Condition="$(TargetFramework.StartsWith('net6.0-windows10'))">
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.755" />

src/ReactiveUI.WinUI/ReactiveUI.WinUI.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.2.221116.1" />
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.2.221209.1" />
   </ItemGroup>
 
   <!-- Workaround for https://github.com/microsoft/WindowsAppSDK/issues/1217