Test with guava 33.3.1-jre, same as Jenkins core (#765)

Author: MarkEWaite

pom.xml

@@ -125,7 +125,7 @@ THE SOFTWARE.
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>31.0.1-jre</version>
+      <version>33.3.1-jre</version>
       <scope>test</scope>
     </dependency>
     <dependency>