move project to Java 21 and the 1.21 Paper API

build.gradle

@@ -1,33 +1,33 @@
 plugins {
     id 'java'
-    id 'com.github.johnrengelman.shadow' version '8.1.1'
+    id 'io.github.goooler.shadow' version '8.1.8' // TODO: Temporarily using fork
 }
 
-group = 'io.github.Jack1424'
-version = '1.4.0'
+group = 'io.github.jack1424'
+version = '2.0.0-DEV'
 
 repositories {
     mavenCentral()
     maven {
-        name = 'papermc-repo'
-        url = 'https://repo.papermc.io/repository/maven-public/'
+        name = "papermc-repo"
+        url = "https://repo.papermc.io/repository/maven-public/"
     }
     maven {
-        name = 'sonatype'
-        url = 'https://oss.sonatype.org/content/groups/public/'
+        name = "sonatype"
+        url = "https://oss.sonatype.org/content/groups/public/"
     }
 }
 
 dependencies {
+    compileOnly("io.papermc.paper:paper-api:1.21-R0.1-SNAPSHOT")
     implementation("org.bstats:bstats-bukkit:3.0.2")
-    implementation("org.bukkit:bukkit:1.13-R0.1-SNAPSHOT")
 }
 
 shadowJar {
     relocate('org.bstats', 'io.github.jack1424.realtimeweather')
 }
 
-def targetJavaVersion = 11
+def targetJavaVersion = 21
 java {
     def javaVersion = JavaVersion.toVersion(targetJavaVersion)
     sourceCompatibility = javaVersion
@@ -38,8 +38,10 @@ java {
 }
 
 tasks.withType(JavaCompile).configureEach {
+    options.encoding = 'UTF-8'
+
     if (targetJavaVersion >= 10 || JavaVersion.current().isJava10Compatible()) {
-        options.release = targetJavaVersion
+        options.release.set(targetJavaVersion)
     }
 }