build(deps): bump FluentAssertions from 6.4.0 to 6.6.0 in /src (#261)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.4.0 to 6.6.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.4.0...6.6.0)

---
updated-dependencies:
- dependency-name: FluentAssertions
  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/Fusillade.Tests/Fusillade.Tests.csproj

@@ -20,7 +20,7 @@
 		<PackageReference Include="xunit.runner.console" Version="2.4.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
 		<PackageReference Include="Xunit.StaFact" Version="1.1.11" />
-		<PackageReference Include="FluentAssertions" Version="6.4.0" />
+		<PackageReference Include="FluentAssertions" Version="6.6.0" />
 		<PackageReference Include="Microsoft.Reactive.Testing" Version="5.0.0" />
 		<PackageReference Include="PublicApiGenerator" Version="10.3.0" />
 		<PackageReference Include="coverlet.msbuild" Version="3.1.2" PrivateAssets="All" />