Bump net.dv8tion:JDA from 5.0.0-beta.18 to 6.4.2 (#8)

Bumps [net.dv8tion:JDA](https://github.com/discord-jda/JDA) from 5.0.0-beta.18 to 6.4.2.
- [Release notes](https://github.com/discord-jda/JDA/releases)
- [Commits](discord-jda/JDA@v5.0.0-beta.18...v6.4.2)

---
updated-dependencies:
- dependency-name: net.dv8tion:JDA
  dependency-version: 6.4.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@
 
 [versions]
 com-electronwill-night-config-toml = "3.6.7"
-net-dv8tion-jda = "5.0.0-beta.18"
+net-dv8tion-jda = "6.4.2"
 
 [libraries]
 com-electronwill-night-config-toml = { module = "com.electronwill.night-config:toml", version.ref = "com-electronwill-night-config-toml" }