Bump FluentAssertions from 5.10.3 to 6.2.0 (#1641)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 5.10.3 to 6.2.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/master/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@5.10.3...6.2.0)

---
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>

Author: dependabot[bot]

test/Directory.Build.props

@@ -12,7 +12,7 @@
     <PackageReference Include="NUnit" Version="3.13.*"/>
     <PackageReference Include="NUnit3TestAdapter" Version="4.0.0"/>
     <PackageReference Include="AutoFixture" Version="4.17.0"/>
-    <PackageReference Include="FluentAssertions" Version="5.10.3"/>
+    <PackageReference Include="FluentAssertions" Version="6.2.0"/>
     <PackageReference Include="coverlet.collector" Version="3.1.0"/>
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.2" PrivateAssets="All" />
   </ItemGroup>