Updated dependencies and added new Maven repository

Added `https://repo.thenextlvl.net/snapshots` to repositories. Updated `net.thenextlvl.core:paper` to version `2.3.0-pre1` in plugin and API modules.

Author: NonSwag

api/build.gradle.kts

@@ -28,6 +28,8 @@ repositories {
 dependencies {
     compileOnlyApi("com.fastasyncworldedit:FastAsyncWorldEdit-Core")
     compileOnly("io.papermc.paper:paper-api:1.21.8-R0.1-SNAPSHOT")
+    
+    compileOnly("net.thenextlvl.core:paper:2.3.0-pre1")
 
     api("net.thenextlvl:nbt:3.0.0-pre1")
     api("net.thenextlvl.core:files:3.0.0")