Bump System.Threading.Tasks.Extensions from 4.5.0 to 4.5.4 (#10)

Bumps [System.Threading.Tasks.Extensions](https://github.com/dotnet/corefx) from 4.5.0 to 4.5.4.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

---
updated-dependencies:
- dependency-name: System.Threading.Tasks.Extensions
  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>

src/LightResults.Extensions.ExceptionHandling/LightResults.Extensions.ExceptionHandling.csproj

@@ -17,7 +17,7 @@
 
     <!-- References -->
     <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-        <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0"/>
+        <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4"/>
     </ItemGroup>
 
     <ItemGroup>