Bump FluentAssertions from 5.10.3 to 6.1.0 (#492)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 5.10.3 to 6.1.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/master/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@5.10.3...6.1.0)

---
updated-dependencies:
- 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>

Packages.props

@@ -40,7 +40,7 @@
     <PackageReference Update="FakeItEasy" Version="7.2.0" />
     <PackageReference Update="FakeItEasy.Analyzer.CSharp" Version="6.1.0" />
     <PackageReference Update="Autofac.Extras.FakeItEasy" Version="7.0.0" />
-    <PackageReference Update="FluentAssertions" Version="5.10.3" />
+    <PackageReference Update="FluentAssertions" Version="6.1.0" />
     <PackageReference Update="FluentAssertions.Analyzers" Version="0.12.0" />
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="16.11.0" />
     <PackageReference Update="Moq" Version="4.16.1" />