Fix Central Portal URL to use OSSRH Staging API compatibility layer

The nexus publish plugin requires the staging API endpoint, not the
Portal REST API which returned 404.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rashidelsanow

build.gradle

@@ -25,8 +25,8 @@ plugins {
 nexusPublishing {
     repositories {
         sonatype {
-            nexusUrl.set(uri("https://central.sonatype.com/api/v1/publisher/"))
-            snapshotRepositoryUrl.set(uri("https://central.sonatype.com/api/v1/publisher/"))
+            nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+            snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
             username = System.getenv('OSSRH_USERNAME_V2') ?: ""
             password = System.getenv('OSSRH_PASSWORD_V2') ?: ""
         }