Bump Splat.Microsoft.Extensions.DependencyInjection from 12.1.4 to 12.1.6 (#68)

Bumps [Splat.Microsoft.Extensions.DependencyInjection](https://github.com/reactiveui/splat) from 12.1.4 to 12.1.6.
- [Release notes](https://github.com/reactiveui/splat/releases)
- [Commits](https://github.com/reactiveui/splat/compare/12.1.4...12.1.6)

---
updated-dependencies:
- dependency-name: Splat.Microsoft.Extensions.DependencyInjection
  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>

NatTypeTester/NatTypeTester.csproj

@@ -25,7 +25,7 @@
     <PackageReference Include="ModernWpfUI" Version="0.9.4" />
     <PackageReference Include="ReactiveUI.Events.WPF" Version="14.2.1" />
     <PackageReference Include="ReactiveUI.WPF" Version="14.2.1" />
-    <PackageReference Include="Splat.Microsoft.Extensions.DependencyInjection" Version="12.1.4" />
+    <PackageReference Include="Splat.Microsoft.Extensions.DependencyInjection" Version="12.1.6" />
     <PackageReference Include="Volo.Abp.Autofac" Version="4.4.0" />
   </ItemGroup>