Bump EmbedIO from 2.8.0 to 2.9.0 (#355)

Bumps [EmbedIO](https://github.com/unosquare/embedio) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/unosquare/embedio/releases)
- [Commits](unosquare/embedio@2.8.0...2.9.0)

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

Author: dependabot-preview[bot]

SpotifyAPI.Web.Auth/SpotifyAPI.Web.Auth.csproj

@@ -15,7 +15,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="EmbedIO" Version="2.8.0" />
+    <PackageReference Include="EmbedIO" Version="2.9.0" />
   </ItemGroup>
 
   <ItemGroup>