security/proxytunnel: Update to 1.11.1 (bugfix release)

PR: 274521
Changes: https://github.com/proxytunnel/proxytunnel/blob/master/CHANGES
Upstream issue: https://github.com/proxytunnel/proxytunnel/issues/59,

		https://github.com/proxytunnel/proxytunnel/issues/69

(cherry picked from commit e794a963332024fcf99cef5db7a9c89a207853b7)