build(deps): update Costura.Fody requirement from 5.6.* to 5.7.*

Updates the requirements on [Costura.Fody](https://github.com/Fody/Costura) to permit the latest version.
- [Release notes](https://github.com/Fody/Costura/releases)
- [Changelog](https://github.com/Fody/Costura/blob/develop/GitReleaseManager.yaml)
- [Commits](https://github.com/Fody/Costura/compare/5.6.0...5.7.0)

---
updated-dependencies:
- dependency-name: Costura.Fody
  dependency-type: direct:production
...
Signed-off-by: Ndependabot[bot] <support@github.com>

src/Showcase/Showcase.WPF.DragDrop.csproj

@@ -32,7 +32,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="Costura.Fody" Version="5.6.*" PrivateAssets="All" />
+        <PackageReference Include="Costura.Fody" Version="5.7.*" PrivateAssets="All" />
     </ItemGroup>
 
     <ItemGroup>