Bump Akka.Hosting.TestKit and FluentAssertions in /src/WebApiTemplate (…

…#353)

Bumps [Akka.Hosting.TestKit](https://github.com/akkadotnet/Akka.Hosting) and [FluentAssertions](https://github.com/fluentassertions/fluentassertions). These dependencies needed to be updated together.

Updates `Akka.Hosting.TestKit` from 1.5.30.1 to 1.5.31
- [Release notes](https://github.com/akkadotnet/Akka.Hosting/releases)
- [Changelog](https://github.com/akkadotnet/Akka.Hosting/blob/dev/RELEASE_NOTES.md)
- [Commits](akkadotnet/Akka.Hosting@1.5.30.1...1.5.31)

Updates `FluentAssertions` from 6.12.1 to 5.10.3
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.12.1...5.10.3)

---
updated-dependencies:
- dependency-name: Akka.Hosting.TestKit
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: FluentAssertions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

src/WebApiTemplate/Directory.Packages.props

@@ -31,6 +31,6 @@
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
     <PackageVersion Include="FluentAssertions" Version="6.12.1" />
     <PackageVersion Include="coverlet.collector" Version="6.0.2" />
-    <PackageVersion Include="Akka.Hosting.TestKit" Version="1.5.30.1" />
+    <PackageVersion Include="Akka.Hosting.TestKit" Version="1.5.31" />
   </ItemGroup>
 </Project>