remove jcenter from buildscripts

buildSrc/src/main/kotlin/com/dfsek/terra/DependencyConfig.kt

@@ -23,7 +23,6 @@ fun Project.configureDependencies() {
         maven { url = uri("https://papermc.io/repo/repository/maven-public/") }
         maven { url = uri("https://maven.fabricmc.net/") }
         gradlePluginPortal()
-        jcenter()
         mavenCentral()
     }
 

platforms/forge/build.gradle.kts.old

@@ -7,7 +7,6 @@ import net.minecraftforge.gradle.userdev.tasks.RenameJarInPlace
 buildscript {
     repositories {
         maven { url = uri("https://files.minecraftforge.net/maven") }
-        jcenter()
         mavenCentral()
         maven { url = uri("https://repo.spongepowered.org/repository/maven-public/") }
     }
@@ -32,7 +31,6 @@ configureCommon()
 
 repositories {
     maven { url = uri("https://files.minecraftforge.net/maven") }
-    jcenter()
     mavenCentral()
     maven { url = uri("https://repo.spongepowered.org/repository/maven-public/") }
 }

platforms/sponge/build.gradle.kts.old

@@ -9,7 +9,6 @@ configureCommon()
 
 repositories {
     mavenCentral()
-    jcenter()
 }
 
 dependencies {