Minor cleanup on the new X509 CT code

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Checklist

• Commits have Signed-off-by: with name/author being identical to the commit author
• 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)
• 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

added 2 commits

• b589511e - X509 CT: defer filling in the length field
• 46f8f6f7 - .gitignore: ignore tests/x509cert-ct

Compare with previous version

@juaristi would you mind checking if this change is ok?

changed milestone to %Release of GnuTLS 3.7.3 release

Hi @dueno Looks good to me!

added 2 commits

• f72591da - X509 CT: defer filling in the length field
• 1ede835c - .gitignore: ignore tests/x509cert-ct

Compare with previous version

requested review from @juaristi

assigned to @dueno

enabled an automatic merge when the pipeline for 1ede835c succeeds

Thanks for the review!

mentioned in commit cf26ab5a

merged