Bump Discord.Net.WebSocket from 3.14.1 to 3.15.0

Bumps [Discord.Net.WebSocket](https://github.com/Discord-Net/Discord.Net) from 3.14.1 to 3.15.0.
- [Release notes](https://github.com/Discord-Net/Discord.Net/releases)
- [Changelog](https://github.com/discord-net/Discord.Net/blob/dev/CHANGELOG.md)
- [Commits](discord-net/Discord.Net@3.14.1...3.15.0)

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

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

src/iTool.DiscordBot/iTool.DiscordBot.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="Battlelog.Net.Bf4" Version="0.2.1" />
     <PackageReference Include="Battlelog.Net.BfH" Version="0.2.0" />
     <PackageReference Include="Discord.Net.Commands" Version="3.14.1" />
-    <PackageReference Include="Discord.Net.WebSocket" Version="3.14.1" />
+    <PackageReference Include="Discord.Net.WebSocket" Version="3.15.0" />
     <PackageReference Include="HOTSLogs.Net" Version="0.1.3" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.9.2" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.4" />