Fix Paper startup before worlds load and add 0.5.0 artifacts

integrations/bluemap/build.gradle

@@ -4,8 +4,13 @@
 repositories {
     maven { url = 'https://repo.bluecolored.de/releases' }
 }
+configurations.compileClasspath {
+    attributes {
+        attribute(org.gradle.api.attributes.java.TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 21)
+    }
+}
 dependencies {
     implementation project(':common')
-    compileOnly 'de.bluecolored.bluemap:BlueMapAPI:2.7.4'
+    compileOnly 'de.bluecolored:bluemap-api:2.7.4'
     implementation 'com.google.code.gson:gson:2.10.1'
 }