Werk #13898: Update stunnel to 5.63

Component	Core & setup
Title	Update stunnel to 5.63
Date	Apr 4, 2022
Level	Trivial Change
Class	Security Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0b5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Update to the latest stunnel version 5.63

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