Bump FluentAssertions from 5.10.3 to 6.0.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 5.10.3 to 6.0.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/master/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@5.10.3...6.0.0)

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

test/MongoDB.Abstracts.Tests/MongoDB.Abstracts.Tests.csproj

@@ -17,7 +17,7 @@
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 		</PackageReference>
 		<PackageReference Include="DataGenerator" Version="5.0.0.178" />
-		<PackageReference Include="FluentAssertions" Version="5.10.3" />
+		<PackageReference Include="FluentAssertions" Version="6.0.0" />
 		<PackageReference Include="MartinCostello.Logging.XUnit" Version="0.1.1" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="5.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="5.0.0" />