Bump AspNet.Security.OAuth.Spotify from 6.0.4 to 6.0.6 (#759)

Bumps [AspNet.Security.OAuth.Spotify](https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers) from 6.0.4 to 6.0.6.
- [Release notes](https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers/releases)
- [Commits](aspnet-contrib/AspNet.Security.OAuth.Providers@6.0.4...6.0.6)

---
updated-dependencies:
- dependency-name: AspNet.Security.OAuth.Spotify
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

SpotifyAPI.Web.Examples/Example.ASP/Example.ASP.csproj

@@ -5,7 +5,7 @@
     <UserSecretsId>da29eac4-4c22-4a7f-b393-379e83b60998</UserSecretsId>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="AspNet.Security.OAuth.Spotify" Version="6.0.4" />
+    <PackageReference Include="AspNet.Security.OAuth.Spotify" Version="6.0.6" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\SpotifyAPI.Web\SpotifyAPI.Web.csproj" />