Bump FluentAssertions from 6.4.0 to 6.5.0 (#584)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.4.0 to 6.5.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.4.0...6.5.0)

---
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>

Directory.Packages.props

@@ -46,7 +46,7 @@
     <PackageVersion Include="coverlet.msbuild" Version="3.1.2" />
     <PackageVersion Include="FakeItEasy" Version="7.3.0" />
     <PackageVersion Include="FakeItEasy.Analyzer.CSharp" Version="6.1.0" />
-    <PackageVersion Include="FluentAssertions" Version="6.4.0" />
+    <PackageVersion Include="FluentAssertions" Version="6.5.0" />
     <PackageVersion Include="FluentAssertions.Analyzers" Version="0.15.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageVersion Include="Rocket.Surgery.Extensions.Testing.FakeItEasy" Version="6.0.4" />