build(deps): bump Xamarin.AndroidX.Legacy.Support.Core.UI (#3078)

Bumps [Xamarin.AndroidX.Legacy.Support.Core.UI](https://github.com/xamarin/AndroidX) from 1.0.0.11 to 1.0.0.12.
- [Release notes](https://github.com/xamarin/AndroidX/releases)
- [Commits](https://github.com/xamarin/AndroidX/commits)

---
updated-dependencies:
- dependency-name: Xamarin.AndroidX.Legacy.Support.Core.UI
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

src/ReactiveUI.AndroidX/ReactiveUI.AndroidX.csproj

@@ -22,7 +22,7 @@
     <PackageReference Include="Xamarin.AndroidX.Preference" Version="1.1.1.11" />
     <PackageReference Include="Xamarin.AndroidX.RecyclerView" Version="1.2.1.3" />
     <PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData" Version="2.3.1.3" />
-    <PackageReference Include="Xamarin.AndroidX.Legacy.Support.Core.UI" Version="1.0.0.11" />
+    <PackageReference Include="Xamarin.AndroidX.Legacy.Support.Core.UI" Version="1.0.0.12" />
     <PackageReference Include="Xamarin.Google.Android.Material" Version="1.4.0.4" />
     <Reference Include="System.Runtime.Serialization" />
   </ItemGroup>