[Backport 2.19] Update maven2 mirror repository url order (#959)

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

Author: peterzhuamazon

build.gradle

@@ -34,8 +34,9 @@ buildscript {
     // Used to resolve build file dependencies
     repositories {
         mavenLocal()
-        maven { url "https://ci.opensearch.org/ci/dbc/snapshots/maven/" }
+        maven { url "https://ci.opensearch.org/maven2/" }
         mavenCentral()
+        maven { url "https://ci.opensearch.org/ci/dbc/snapshots/maven/" }
         maven { url "https://plugins.gradle.org/m2/" }
     }
 
@@ -198,8 +199,9 @@ publishing {
 
 repositories {
     mavenLocal()
-    maven { url "https://ci.opensearch.org/ci/dbc/snapshots/maven/" }
+    maven { url "https://ci.opensearch.org/maven2/" }
     mavenCentral()
+    maven { url "https://ci.opensearch.org/ci/dbc/snapshots/maven/" }
     maven { url "https://plugins.gradle.org/m2/" }
 }