remove sonatype repository (unused)

build.gradle

@@ -12,10 +12,6 @@ repositories {
         name = "papermc-repo"
         url = uri("https://repo.papermc.io/repository/maven-public/")
     }
-    maven {
-        name = "sonatype"
-        url = uri("https://oss.sonatype.org/content/groups/public/")
-    }
 }
 
 dependencies {