deps: update dependency com.google.cloud:google-iam-policy to v1.6.19 (#551)

Author: renovate-bot

java-iam/samples/cloud-client/snippets/pom.xml

@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-iam-policy</artifactId>
-      <version>1.6.18</version>
+      <version>1.6.19</version>
       <scope>compile</scope>
     </dependency>
     <dependency>