Bump io.javalin:javalin from 6.3.0 to 6.4.0

Bumps [io.javalin:javalin](https://github.com/javalin/javalin) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/javalin/javalin/releases)
- [Commits](javalin/javalin@javalin-parent-6.3.0...javalin-parent-6.4.0)

---
updated-dependencies:
- dependency-name: io.javalin:javalin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -60,7 +60,7 @@ dependencies {
     implementation group: 'com.github.rainestormee', name: 'jda-command', version: '1.1.5'
     implementation group: 'com.github.ben-manes.caffeine', name: 'caffeine', version: '3.1.8'
     implementation group: 'org.projectlombok', name: 'lombok', version: '1.18.34'
-    implementation group: 'io.javalin', name: 'javalin', version: '6.3.0'
+    implementation group: 'io.javalin', name: 'javalin', version: '6.4.0'
     implementation group: 'org.json', name: 'json', version: '20240303'
     implementation group: 'com.squareup.okhttp3', name: 'okhttp', version: '4.12.0'
 }