Bump FluentAssertions from 6.12.0 to 6.12.1 in /Solutions

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] <[email protected]>

Solutions/Corvus.Json.Specs/Corvus.Json.Specs.csproj

@@ -55,7 +55,7 @@
 		<!-- Required for publishing test results directly to Azure Pipelines -->
 		<PackageReference Include="azurepipelines.testlogger" Version="1.2.3" />
 
-		<PackageReference Include="FluentAssertions" Version="6.12.0" />
+		<PackageReference Include="FluentAssertions" Version="6.12.1" />
 
 		<ProjectReference Include="..\Corvus.Json.CodeGeneration.201909\Corvus.Json.CodeGeneration.201909.csproj" />