chore(deps): update dependency fluentassertions to 6.12.1

Author: renovate[bot]

src/directory.packages.props

@@ -24,7 +24,7 @@
   <ItemGroup>
     <PackageVersion Include="coverlet.collector" Version="6.0.2" />
     <PackageVersion Include="coverlet.msbuild" Version="6.0.2" />
-    <PackageVersion Include="FluentAssertions" Version="6.12.0" />
+    <PackageVersion Include="FluentAssertions" Version="6.12.1" />
     <PackageVersion Include="FluentAssertions.Analyzers" Version="0.33.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.0.1" />