build(deps): update Splat.Ninject requirement from 13.* to 14.* in /src (#3053)

Updates the requirements on [Splat.Ninject](https://github.com/reactiveui/splat) to permit the latest version.
- [Release notes](https://github.com/reactiveui/splat/releases)
- [Commits](reactiveui/splat@13.1.1...14.1.1)

---
updated-dependencies:
- dependency-name: Splat.Ninject
  dependency-type: direct:production
...

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src/ReactiveUI.Splat.Tests/ReactiveUI.Splat.Tests.csproj

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="Splat.Autofac" Version="14.*" />
     <PackageReference Include="Splat.DryIoc" Version="14.*" />
-    <PackageReference Include="Splat.Ninject" Version="13.*" />
+    <PackageReference Include="Splat.Ninject" Version="14.*" />
   </ItemGroup>
 
   <ItemGroup>