fix(build): fix build after dependency upgrades

.gitignore

@@ -5,4 +5,5 @@
 
 .gradle
 build
-**/run*/
+**/run*/
+.kotlin

build.gradle.kts

@@ -15,20 +15,23 @@
  *     along with UnifiedMetrics.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import org.jetbrains.kotlin.gradle.dsl.KotlinJvmProjectExtension
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
     kotlin("jvm") version "2.0.0" apply false
     kotlin("kapt") version "2.0.0" apply false
     kotlin("plugin.serialization") version "2.0.0" apply false
     id("com.github.johnrengelman.shadow") version "8.1.1" apply false
+
+    // The fabric-loom plugin must be defined in the root project for it to function properly.
+    id("fabric-loom") version "1.7.1" apply false
 }
 
 allprojects {
     group = "dev.cubxity.plugins"
     description = "Fully featured metrics collector agent for Minecraft servers."
-    version = "0.3.9-SNAPSHOT"
+    version = "0.3.10-SNAPSHOT"
 
     repositories {
         mavenCentral()
@@ -42,8 +45,8 @@ subprojects {
     apply(plugin = "maven-publish")
 
     tasks.withType<KotlinCompile> {
-        kotlinOptions {
-            kotlinOptions.jvmTarget = "1.8"
+        compilerOptions {
+            jvmTarget.set(JvmTarget.JVM_1_8)
             freeCompilerArgs = listOf("-opt-in=kotlin.RequiresOptIn")
         }
     }

platforms/bungee/build.gradle.kts

@@ -21,12 +21,13 @@ plugins {
 
 repositories {
     maven("https://oss.sonatype.org/content/repositories/snapshots/")
+    maven("https://libraries.minecraft.net")
 }
 
 dependencies {
     api(project(":unifiedmetrics-core"))
 
-    compileOnly("net.md-5", "bungeecord-api", "1.20-R0.2")
+    compileOnly("net.md-5", "bungeecord-api", "1.21-R0.1-SNAPSHOT")
 }
 
 tasks {

platforms/fabric/build.gradle.kts

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 /*
  *     This file is part of UnifiedMetrics.
  *
@@ -16,7 +18,7 @@
  */
 
 plugins {
-    id("fabric-loom") version "1.7.1"
+    id("fabric-loom")
 }
 
 val transitiveInclude: Configuration by configurations.creating {
@@ -54,11 +56,12 @@ loom {
             isIdeConfigGenerated = true
         }
     }
+    serverOnlyMinecraftJar()
 }
 
 tasks {
     compileKotlin {
-        kotlinOptions.jvmTarget = "16"
+        compilerOptions.jvmTarget.set(JvmTarget.JVM_16)
     }
     processResources {
         filesMatching("fabric.mod.json") {