Use new snapshot repository in documentation

Author: acogoluegnes

src/docs/asciidoc/setup.adoc

@@ -139,8 +139,8 @@ With Maven:
 <repositories>
 
   <repository>
-    <id>ossrh</id>
-    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+    <id>central-portal-snapshots</id>
+    <url>https://central.sonatype.com/repository/maven-snapshots/</url>
     <snapshots><enabled>true</enabled></snapshots>
     <releases><enabled>false</enabled></releases>
   </repository>
@@ -154,7 +154,14 @@ With Gradle:
 [source,groovy,subs="attributes,specialcharacters"]
 ----
 repositories {
-  maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
+  maven {
+    name = 'Central Portal Snapshots'
+    url = 'https://central.sonatype.com/repository/maven-snapshots/'
+    // Only search this repository for the specific dependency
+    content {
+      includeModule("com.rabbitmq", "{project-artifact-id}")
+    }
+  }
   mavenCentral()
 }
 ----