update: libssh2 (Terrapin)

[dongsupark]

Name: libssh2
CVEs: CVE-2023-48795
CVSSs: 5.9
Action Needed: TBD

Summary: The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack.

This is the same CVE as #1301, but the issue is only about libssh2.

There is still no release for the fix. The fix PR was already merged.

refmap.gentoo: TBD