openvpn -- two security fixes

Gert Doering reports that OpenVPN 2.6.11 fixes two security bugs (three on Windows):

CVE-2024-5594: control channel: refuse control channel messages with nonprintable characters in them. Security scope: a malicious openvpn peer can send garbage to openvpn log, or cause high CPU load. (Reynir Björnsson)
CVE-2024-28882: only call schedule_exit() once (on a given peer). Security scope: an authenticated client can make the server “keep the session” even when the server has been told to disconnect this client. (Reynir Björnsson)