Bump undici and discord.js

Bumps [undici](https://github.com/nodejs/undici) to 6.21.1 and updates ancestor dependency [discord.js](https://github.com/discordjs/discord.js/tree/HEAD/packages/discord.js). These dependencies need to be updated together.


Updates `undici` from 6.13.0 to 6.21.1
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.13.0...v6.21.1)

Updates `discord.js` from 14.15.2 to 14.18.0
- [Release notes](https://github.com/discordjs/discord.js/releases)
- [Changelog](https://github.com/discordjs/discord.js/blob/14.18.0/packages/discord.js/CHANGELOG.md)
- [Commits](https://github.com/discordjs/discord.js/commits/14.18.0/packages/discord.js)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 6.21.1
  dependency-type: indirect
- dependency-name: discord.js
  dependency-version: 14.18.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "better-sqlite3": "^10.0.0",
     "check-dependencies": "^2.0.0",
     "discord-hybrid-sharding": "^2.2.0",
-    "discord.js": "^14.15.2",
+    "discord.js": "^14.18.0",
     "i18n-light": "^0.5.4",
     "node-cron": "^3.0.3",
     "quick.db": "^9.1.7"