deps: update Guava (#1938)

* deps: update Guava and Truth

@suztomo

* revert Truth

Author: elharo

pom.xml

@@ -39,7 +39,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <guava.version>30.0-jre</guava.version>
+    <guava.version>30.1-jre</guava.version>
     <javac.version>9+181-r4173-1</javac.version>
     <maven.version>3.6.3</maven.version>
     <resolver.version>1.6.1</resolver.version>