Bump com.electronwill.night-config:toml from 3.6.7 to 3.9.0 (#12)

Bumps [com.electronwill.night-config:toml](https://github.com/TheElectronWill/night-config) from 3.6.7 to 3.9.0.
- [Release notes](https://github.com/TheElectronWill/night-config/releases)
- [Commits](TheElectronWill/night-config@v3.6.7...v3.9.0)

---
updated-dependencies:
- dependency-name: com.electronwill.night-config:toml
  dependency-version: 3.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 # https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
 
 [versions]
-com-electronwill-night-config-toml = "3.6.7"
+com-electronwill-night-config-toml = "3.9.0"
 net-dv8tion-jda = "6.4.2"
 
 [libraries]