Update sonatype publishing urls (#100)

Author: jyaganeh

android/build.gradle

@@ -31,9 +31,15 @@ nexusPublishing {
     if (user != null && pass != null) {
         repositories {
             sonatype {
+                // see: https://central.sonatype.org/publish/publish-portal-ossrh-staging-api/#configuration
+                nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+                snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
+
                 username.set(user)
                 password.set(pass)
-                stagingProfileId.set(profileId)
+                if (!profileId.isNullOrEmpty()) {
+                    stagingProfileId.set(profileId)
+                }
             }
         }
         transitionCheckOptions {