[android] Add mavenCentral repository for release publishing (#4067)

ghstack-source-id: 7a9c81f1786b94ee9d542a3c4bf1ba87b7e83e57
Pull Request resolved: https://github.com/pytorch/vision/pull/4066

Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

android/ops/build.gradle

@@ -3,6 +3,7 @@ apply plugin: 'maven'
 
 repositories {
   jcenter()
+  mavenCentral()
   maven {
     url "https://oss.sonatype.org/content/repositories/snapshots"
   }

android/test_app/app/build.gradle

@@ -2,6 +2,7 @@ apply plugin: 'com.android.application'
 
 repositories {
     jcenter()
+    mavenCentral()
     maven {
         url "https://oss.sonatype.org/content/repositories/snapshots"
     }