build(deps): bump SimpleInjector from 4.4.3 to 4.6.0 (#325)

Bumps [SimpleInjector](https://github.com/simpleinjector/SimpleInjector) from 4.4.3 to 4.6.0.
- [Release notes](https://github.com/simpleinjector/SimpleInjector/releases)
- [Commits](simpleinjector/SimpleInjector@v4.4.3...v4.6)

Signed-off-by: dependabot[bot] <support@dependabot.com>

src/Splat.SimpleInjector/Splat.SimpleInjector.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="SimpleInjector" Version="4.4.3" />
+    <PackageReference Include="SimpleInjector" Version="4.6.0" />
   </ItemGroup>
 
   <ItemGroup>