Updated dependencies.

This is a massive commit incorporating 5 years' worth of upstream dependencies updates all at once, particularly with JDA. Several classpaths and APIs changed, requiring some rework. The bot is mostly functional as a result, but issues remain with reaction callbacks and playing audio from YouTube.

build.gradle

@@ -1,27 +1,38 @@
 buildscript {
     repositories {
-        jcenter()
+        gradlePluginPortal()
     }
-
     dependencies {
-        classpath 'com.github.jengelman.gradle.plugins:shadow:4.0.4'
+        classpath 'com.github.johnrengelman:shadow:8.1.1'
     }
 }
 
-apply plugin: 'java'
 apply plugin: 'com.github.johnrengelman.shadow'
+apply plugin: 'java'
 
 repositories {
-    jcenter()
+    mavenCentral()
+
+    maven {
+        name 'm2-dv8tion'
+        url 'https://m2.dv8tion.net/releases'
+    }
+
+    maven {
+        url 'https://m2.dv8tion.net/releases'
+    }
+
+    maven {
+        url 'https://jitpack.io'
+    }
 }
 
 dependencies {
-    implementation 'org.slf4j:slf4j-simple:1.7.26'
+    implementation 'org.slf4j:slf4j-simple:2.0.13'
 
-    implementation 'net.dv8tion:JDA:3.8.3_463'
-    implementation 'com.sedmelluq:lavaplayer:1.3.17'
-    implementation 'redis.clients:jedis:3.0.1'
-    implementation 'com.vdurmont:emoji-java:4.0.0'
+    implementation 'net.dv8tion:JDA:5.0.0-beta.24'
+    implementation 'dev.arbjerg:lavaplayer:2.1.1'
+    implementation 'redis.clients:jedis:5.1.3'
 }
 
 jar {