Bump Guava dependency to >=24.1.1

In response to CVE-2018-10237

Author: emlun

build.gradle

@@ -54,7 +54,7 @@ Map<String, String> dependencyVersions = [
   'com.fasterxml.jackson.core:jackson-databind:[2.11.0,3)',
   'com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:[2.11.0,3)',
   'com.fasterxml.jackson.datatype:jackson-datatype-jdk8:[2.11.0,3)',
-  'com.google.guava:guava:[19.0,20)',
+  'com.google.guava:guava:[24.1.1,30)',
   'com.upokecenter:cbor:[4.0.1,5)',
   'javax.activation:activation:[1.1.1,2)',
   'javax.ws.rs:javax.ws.rs-api:[2.1,3)',