Bump net.dv8tion:JDA from 5.0.0-beta.12 to 5.0.0-beta.15

Bumps [net.dv8tion:JDA](https://github.com/discord-jda/JDA) from 5.0.0-beta.12 to 5.0.0-beta.15.
- [Release notes](https://github.com/discord-jda/JDA/releases)
- [Commits](discord-jda/JDA@v5.0.0-beta.12...v5.0.0-beta.15)

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

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -30,7 +30,7 @@ repositories {
 }
 
 dependencies {
-    shadow 'net.dv8tion:JDA:5.0.0-beta.12'
+    shadow 'net.dv8tion:JDA:5.0.0-beta.15'
     shadow 'io.sentry:sentry-logback:6.21.0'
     shadow 'org.codehaus.groovy:groovy-jsr223:3.0.18'
     shadow 'org.jsoup:jsoup:1.16.1'