deps: update dependency com.google.guava:guava to v30 (#68)

Author: renovate-bot

pom.xml

@@ -67,7 +67,7 @@
  <protobuf.version>3.13.0</protobuf.version>
  <junit.version>4.13.1</junit.version>
  <grpc.version>1.32.2</grpc.version>
- <guava.version>29.0-android</guava.version>
+ <guava.version>30.0-android</guava.version>
  </properties>
 
  <dependencyManagement>