Bump FluentAssertions from 5.5.3 to 5.6.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 5.5.3 to 5.6.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Commits](fluentassertions/fluentassertions@5.5.3...5.6.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

Tests/Serilog.Exceptions.Test/Serilog.Exceptions.Test.csproj

@@ -19,7 +19,7 @@
   </ItemGroup>
 
   <ItemGroup Label="Package References">
-    <PackageReference Include="FluentAssertions" Version="5.5.3" />
+    <PackageReference Include="FluentAssertions" Version="5.6.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.1" />
     <PackageReference Include="Moq" Version="4.10.1" />