chore: Ignore j2objc-annotations in gax

Author: lqiu96

gax-java/pom.xml

@@ -78,6 +78,10 @@
             <groupId>com.google.errorprone</groupId>
             <artifactId>error_prone_annotations</artifactId>
           </exclusion>
+          <exclusion>
+            <groupId>com.google.j2objc</groupId>
+            <artifactId>j2objc-annotations</artifactId>
+          </exclusion>
         </exclusions>
       </dependency>
       <dependency>