GnuTLS | Fix TLS 1.3 handshake (!2095)

Romain Tartière created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2095

Project:Branches: smortex/gnutls:fix-tls-1.3-handshake to gnutls/gnutls:master
Author:   Romain Tartière



Add the signature_algorithms_cert to the list of allowed algorithms if present, and fallback to the signature_algorithms otherwise.

This better fit [RFC8446 section 4.2.3][1]:

> If no "signature_algorithms_cert" extension is present, then the "signature_algorithms" extension also applies to signatures appearing in certificates.

This fix TLS 1.3 handshake with Java after [JDK-8349583][2].

Closes: #1842 

[1]: https://datatracker.ietf.org/doc/html/rfc8446#section-4.2.3
[2]: https://bugs.openjdk.org/browse/JDK-8349583

## 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
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## 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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