Bump Discord.Net.Commands from 3.15.2 to 3.15.3

Bumps [Discord.Net.Commands](https://github.com/Discord-Net/Discord.Net) from 3.15.2 to 3.15.3.
- [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@3.15.2...3.15.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

src/iTool.DiscordBot/iTool.DiscordBot.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Battlelog.Net.Bf3" Version="0.2.0" />
     <PackageReference Include="Battlelog.Net.Bf4" Version="0.2.1" />
     <PackageReference Include="Battlelog.Net.BfH" Version="0.2.0" />
-    <PackageReference Include="Discord.Net.Commands" Version="3.15.2" />
+    <PackageReference Include="Discord.Net.Commands" Version="3.15.3" />
     <PackageReference Include="Discord.Net.WebSocket" Version="3.15.3" />
     <PackageReference Include="HOTSLogs.Net" Version="0.1.3" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.10.0" />