[android_compat_fixes] replaced deprecated 'jcenter' repo with 'mavenCentral' in Android project generator template

Signed-off-by: AMZN-ScottR <24445312+AMZN-ScottR@users.noreply.github.com>

Code/Tools/Android/ProjectBuilder/root.build.gradle.in

@@ -8,7 +8,7 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:${ANDROID_GRADLE_PLUGIN_VERSION}'
@@ -21,7 +21,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }