Bump AspNet.Security.OAuth.Spotify from 5.0.3 to 5.0.4 (#595)

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="5.0.3" />
+    <PackageReference Include="AspNet.Security.OAuth.Spotify" Version="5.0.4" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\SpotifyAPI.Web\SpotifyAPI.Web.csproj" />