update to 1.3.6c, fix for boo#1164572 (CVE-2020-9272, gh#902), fix for boo#1164574 (CVE-2020-9273, gh#903) OBS-URL: https://build.opensuse.org/request/show/778853 OBS-URL: https://build.opensuse.org/package/show/network/proftpd?expand=0&rev=76
udpate to 1.3.6b OBS-URL: https://build.opensuse.org/request/show/747208 OBS-URL: https://build.opensuse.org/package/show/network/proftpd?expand=0&rev=69