[gnutls-devel] GnuTLS | tls13/key_update: Expose a manual KeyUpdate function (!1965)

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Alistair Francis created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1965

Project:Branches: alistair23/gnutls:alistair/key-update to gnutls/gnutls:master
Author:   Alistair Francis




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

As part of supporting KeyUpdate in ktls-utils and NVMe-OF we need to
trigger an update of the local keys after the kernel has received a
KeyUpdate message.

This patch creates a new `gnutls_session_trigger_key_update()` function
that allows updating the local keys without sending any KeyUpdate
requests.

## Checklist
 * [X] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [X] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [X] Documentation updated / NEWS entry present (for non-trivial changes)
 * [X] 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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