build(deps): bump FodyHelpers from 5.2.0 to 6.0.0 (#2142)

Bumps [FodyHelpers](https://github.com/Fody/Fody) from 5.2.0 to 6.0.0.
- [Release notes](https://github.com/Fody/Fody/releases)
- [Commits](https://github.com/Fody/Fody/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

src/ReactiveUI.Fody/ReactiveUI.Fody.csproj

@@ -8,6 +8,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FodyHelpers" Version="5.2.0" />
+    <PackageReference Include="FodyHelpers" Version="6.0.0" />
   </ItemGroup>
 </Project>