Update jetty 9.4.30.v20200611 to 9.4.31.v20200723 (fixes #339)
Update jetty 9.4.30.v20200611 to 9.4.31.v20200723 (fixes #339)

marcelmay/greenmail,marcelmay/greenmail,marcelmay/greenmail,marcelmay/greenmail,marcelmay/greenmail,greenmail-mail-test/greenmail,greenmail-mail-test/greenmail,greenmail-mail-test/greenmail