Bump FluentAssertions from 6.12.0 to 6.12.1

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.12.0 to 6.12.1.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.12.0...6.12.1)

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

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

firely-validator-api-tests.props

@@ -13,7 +13,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Moq" Version="4.18.4" />
-		<PackageReference Include="FluentAssertions" Version="6.12.0" />
+		<PackageReference Include="FluentAssertions" Version="6.12.1" />
 		<PackageReference Include="MessagePack" Version="2.5.172" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
 		<PackageReference Include="MSTest.TestAdapter" Version="3.4.0" />