[Bot -> All](deps): Bump Discord.Net in /Source/SammBot.Bot

Bumps [Discord.Net](https://github.com/discord-net/Discord.Net) from 3.15.3 to 3.16.0.
- [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@3.15.3...3.16.0)

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

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

Source/SammBot.Bot/SammBot.Bot.csproj

@@ -49,7 +49,7 @@
 
     <ItemGroup>
         <PackageReference Include="AnalogFeelings.Matcha" Version="2.1.0"/>
-        <PackageReference Include="Discord.Net" Version="3.15.3" />
+        <PackageReference Include="Discord.Net" Version="3.16.0" />
         <PackageReference Include="Figgle" Version="0.5.1"/>
         <PackageReference Include="JetBrains.Annotations" Version="2024.2.0"/>
         <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.8">