deps: using shared deps for iam proto dependency version (#387)

Author: suztomo

pom.xml

@@ -83,18 +83,6 @@
         <artifactId>grpc-google-cloud-security-private-ca-v1beta1</artifactId>
         <version>0.9.5-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-security-private-ca-v1beta1:current} -->
       </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>proto-google-iam-v1</artifactId>
-        <version>1.2.8</version>
-      </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>grpc-google-iam-v1</artifactId>
-        <version>1.2.7</version>
-      </dependency>
-
-
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>