deps: update dependency com.google.api.grpc:grpc-google-iam-v1 to v1.2.1

Author: renovate-bot

pom.xml

@@ -91,7 +91,7 @@
  <dependency>
  <groupId>com.google.api.grpc</groupId>
  <artifactId>grpc-google-iam-v1</artifactId>
- <version>1.1.7</version>
+ <version>1.2.1</version>
  </dependency>