chore(deps): update dependency fluentassertions to v6.12.0

Author: renovate[bot]

Tests/Tests.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="6.8.0" />
+    <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
     <PackageReference Include="Moq" Version="4.18.3" />
     <PackageReference Include="System.IO.Abstractions" Version="17.1.1" />