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

Author: renovate[bot]

config/CommonTests.targets

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="6.11.0"/>
+    <PackageReference Include="FluentAssertions" Version="6.12.0"/>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.1"/>
     <PackageReference Include="xunit" Version="2.5.0"/>
     <PackageReference Include="System.Linq.Async" Version="6.0.1"/>