stop using Google maven mirror

Author: chingor13

google-cloud-pom-parent/pom.xml

@@ -148,11 +148,6 @@
   </profiles>
 
   <repositories>
-    <repository>
-      <id>google-maven-central-copy</id>
-      <name>Google Maven Central copy</name>
-      <url>https://maven-central.storage-download.googleapis.com/maven2</url>
-    </repository>
     <repository>
       <id>maven-central</id>
       <name>Maven Central</name>

sdk-platform-java/gapic-generator-java-pom-parent/pom.xml

@@ -228,11 +228,6 @@
     </profile>
   </profiles>
   <repositories>
-    <repository>
-      <id>google-maven-central-copy</id>
-      <name>Google Maven Central copy</name>
-      <url>https://maven-central.storage-download.googleapis.com/maven2</url>
-    </repository>
     <repository>
       <id>maven-central</id>
       <name>Maven Central</name>