Update secure_coding_guidelines.md
What does this MR do and why?
Background: a prospective customer who requires the most up-to-date encryption mechanisms, was confused about the language regarding TLS versioning in the documentation (ie whether GitLab allowed the use of older TLS versions).
This update more directly states that only TLS 1.2 and above can be used inside GitLab.
Describe in detail what your merge request does and why.
Screenshots or screen recordings
These are strongly recommended to assist reviewers and reduce the time to merge your change.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Andrew Thomas