fix: Remove iam dependency

Author: lqiu96

proto-google-cloud-network-security-v1/pom.xml

@@ -21,10 +21,6 @@
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-common-protos</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>proto-google-iam-v1</artifactId>
-    </dependency>
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>api-common</artifactId>