[gnutls-devel] GnuTLS | ext/supported_versions: reorder client precedence if necessary (!1074)

[Development of GNU's TLS library]

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/merge_requests/1074

Branches: tmp-supported-versions to master
Author:    Daiki Ueno



If the client advertises TLS < 1.2 before TLS 1.3 and the server is configured with TLS 1.3 enabled, the server should select TLS 1.3; otherwise the client will disconnect when seeing downgrade sentinel.

Fixes #837.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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