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

….5.2 (#865)

java-core/pom.xml

@@ -154,7 +154,7 @@
     <gax.version>2.18.4</gax.version>
     <google.api-common.version>2.2.1</google.api-common.version>
     <google.common-protos.version>2.9.1</google.common-protos.version>
-    <google.iam.version>1.5.0</google.iam.version>
+    <google.iam.version>1.5.2</google.iam.version>
     <google.auth.version>1.8.1</google.auth.version>
     <google.api.version>1.35.2</google.api.version>
     <google.http.version>1.42.1</google.http.version>