contrib: update dav1d to 1.4.3

1.4.3 is a very small release focused on security issues:

• AArch64: Fix potential out of bounds access in DotProd H/HV filters
• cli: Prevent buffer over-read

changed milestone to %4.0

added Component::Build system: Contribs Status::BackportCandidate labels

approved this merge request

added MRStatus::Acceptable label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

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added 2 commits

• b4d7a10c - 1 commit from branch videolan:master
• 900a4290 - contrib: update dav1d to 1.4.3

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enabled an automatic merge when the pipeline for 900a4290 succeeds

merged