Bump Uno.WinUI from 4.9.26 to 4.9.45 in /src (#102)

Bumps [Uno.WinUI](https://github.com/unoplatform/uno) from 4.9.26 to 4.9.45.
- [Release notes](https://github.com/unoplatform/uno/releases)
- [Commits](https://github.com/unoplatform/uno/commits)

---
updated-dependencies:
- dependency-name: Uno.WinUI
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/ReactiveUI.Uno.WinUI/ReactiveUI.Uno.WinUI.csproj

@@ -32,7 +32,7 @@
     </Reference>
   </ItemGroup>
   <ItemGroup Condition=" !$(TargetFramework.StartsWith('net6.0-windows10')) ">
-    <PackageReference Include="Uno.WinUI" Version="4.9.26" />
+    <PackageReference Include="Uno.WinUI" Version="4.9.45" />
   </ItemGroup>
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net6.0-windows10')) or $(TargetFramework.StartsWith('net7.0-windows10')) ">
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />