Security update for stunnel

This update for stunnel fixes the following issues:

- Security fix: [bsc#1177580, bsc#1182529, CVE-2021-20230]
* "redirect" option does not properly handle "verifyChain = yes"

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Fixed bugs
bnc#1177580
VUL-0: CVE-2021-20230: stunnel: "redirect" option does not properly handle "verifyChain = yes"
bnc#1182529
VUL-0: stunnel: Security problem in redirect option for unauthenticated requests
Selected Binaries
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