Bump Discord.Net from 3.8.1 to 3.9.0 in /Boyfriend

Bumps [Discord.Net](https://github.com/discord-net/Discord.Net) from 3.8.1 to 3.9.0.
- [Release notes](https://github.com/discord-net/Discord.Net/releases)
- [Changelog](https://github.com/discord-net/Discord.Net/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/discord-net/Discord.Net/compare/3.8.1...3.9.0)

---
updated-dependencies:
- dependency-name: Discord.Net
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Boyfriend/Boyfriend.csproj

@@ -28,7 +28,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Discord.Net" Version="3.8.1"/>
+        <PackageReference Include="Discord.Net" Version="3.9.0"/>
         <PackageReference Include="Humanizer.Core" Version="2.14.1"/>
         <PackageReference Include="Humanizer.Core.ru" Version="2.14.1"/>
     </ItemGroup>