Werk #11958: Update openssl to 1.1.1k

Component	Other components
Title	Update openssl to 1.1.1k
Date	Apr 12, 2021
Level	Trivial Change
Class	Security Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Updating openssl because of security fixes.

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