build(deps): bump SimpleInjector from 5.3.3 to 5.4.0 in /src (#942)

Bumps [SimpleInjector](https://github.com/simpleinjector/SimpleInjector) from 5.3.3 to 5.4.0.
- [Release notes](https://github.com/simpleinjector/SimpleInjector/releases)
- [Commits](simpleinjector/SimpleInjector@v5.3.3...v5.4.0)

---
updated-dependencies:
- dependency-name: SimpleInjector
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

src/Splat.SimpleInjector/Splat.SimpleInjector.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="SimpleInjector" Version="5.3.3" />
+    <PackageReference Include="SimpleInjector" Version="5.4.0" />
   </ItemGroup>
 
   <ItemGroup>