Per Jenkins Dev thread - Plugins using removed Guava APIs, a new release of the sonar-scanner-jenkins is required to incorporate
PR#203 - [JENKINS-66308] Prepare SonarQube Scanner for core Guava upgrade.
Do you have a timeline for that release? It appears to have already been merged, along w/some other PRs.
Also, strangely, GitHub seems to think the “latest release” of the plugin is 2.3 (Latest) on Oct 30, 2015.
The releases page does show a newer release, just not tagged as latest. Perhaps that can be corrected?