[error-prone] JdkObsolete in jdk.management.agent

src/jdk.management.agent/share/classes/jdk/internal/agent/Agent.java:666: warning: [JdkObsolete] StringBuffer performs synchronization that is usually unnecessary; prefer String
Builder.
           StringBuffer message = new StringBuffer(params[0]);
                                  ^
    (see https://errorprone.info/bugpattern/JdkObsolete.md)