chore(deps): update dependency fluentassertions to 6.12.1

Author: renovate[bot]

Directory.Packages.props

@@ -39,7 +39,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
     <PackageVersion Include="xunit" Version="2.9.0" />
-    <PackageVersion Include="FluentAssertions" Version="6.12.0" />
+    <PackageVersion Include="FluentAssertions" Version="6.12.1" />
     <PackageVersion Include="Verify.Xunit" Version="26.4.1" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.4.0" />
     <PackageVersion Include="NSubstitute" Version="5.1.0" />