Security update for libssh

This update for libssh fixes the following issue:

Issue addressed:

- Added support for new AES-GCM encryption types (bsc#1134193).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1134193
L3-Question: libssh4 security backport for hmac-sha2-512-etm and aes256-gcm code
Selected Binaries
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