Bump Discord.Net from 3.17.4 to 3.18.0

---
updated-dependencies:
- dependency-name: Discord.Net
  dependency-version: 3.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

SysBot.Pokemon.Discord/SysBot.Pokemon.Discord.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-		<PackageReference Include="Discord.Net" Version="3.17.4" />
+		<PackageReference Include="Discord.Net" Version="3.18.0" />
 		<PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.5" />
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.5" />
 		<PackageReference Include="PKHeX.Core" Version="25.5.18" />