sslh 1.18-1 high CPU load -> Fix available

[muelmanu]

System: Ubuntu 18.04 LTS
Software: sslh v1.18-1

The Problem is that the sslh-daemon causes 100% load after a while.
The bug seems to be reported and fixed in december 2020 at the the ssl-project.

Should be fixed in v1.21b or newer. So please backport/update the package accordingly to fix the problem for everyone.

See:
https://github.com/yrutschle/sslh/issues/284

And for the fix in code:
https://github.com/yrutschle/sslh/commit/1e33455fe76078d97ea4ce1c8b856df2dea64c71

Workaround: We put a cronjob that kills/restarts sslhd every 3hours and after that we tried to update the binaries from source ourselves.

[Sergey Ponomarev (stokito)]

FYI: The Ubuntu uses a Debian package without modifications and its sources are here https://salsa.debian.org/debian/sslh
I hope the Ubuntu maintainer will grab a new version soon.