dependabot security update from GitHub

Author: m999rvi

pom.xml

@@ -15,7 +15,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
-        <guava.version>29.0-jre</guava.version>
+        <guava.version>30.0-jre</guava.version>
         <junit.version>4.13.1</junit.version>
         <assertj.version>3.15.0</assertj.version>
         <mockito.version>3.3.3</mockito.version>