Fix terrapin CVE-2023-48795 for gitlab-org/gitlab#435956

What does this MR do?

The terrapin vulnerability of https://terrapin-attack.com/ made openssh in gitlab helmchart affected.

Related issues

• Initial report at gitlab-org/gitlab#435956

Author checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Merge Request Title and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• When ready for review, follow the instructions in the "Reviewer Roulette" section of the Danger Bot MR comment, as per the Distribution experimental MR workflow

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Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added/updated
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened -> chacha20-poly1305@openssh.com cannot be found in omnibus
• Equivalent MR/issue for Gitlab Operator project opened (see Operator documentation on impact of Charts changes) chacha20-poly1305@openssh.com cannot be found in operator
• Validate potential values for new configuration settings. Formats such as integer 10, duration 10s, URI scheme://user:passwd@host:port may require quotation or other special handling when rendered in a template and written to a configuration file.