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Rebase stunnel to 5.56.

Since the version 5.48, there have been several new features and bug fixes.
Most bug fixes are medium or high priority.

Especially the bug which is marked high - https://bugzilla.redhat.com/show_bug.cgi?id=1665899

Release 5.55 and 5.56 have urgency high.

Hi Jan,

New features:
1. New "ticketKeySecret" and "ticketMacSecret" options to control confidentiality and integrity protection of the issued session tickets. These options allow for session resumption on other nodes in a cluster
2. New "curves" option to control the list of elliptic curves in OpenSSL 1.1.0 and later.
3. New "ciphersuites" option to control the list of permitted TLS 1.3 ciphersuites.
4. Added sslVersion, sslVersionMin and sslVersionMax for OpenSSL 1.1.0 and later.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (stunnel bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4440