tools: Require meson 0.56+

medialibrary now requires 0.56

This MR also bumps the win64 image to a more recent one, that ships a recent enough meson

changed milestone to %4.0

added Component::Build system label

added MRStatus::Reviewable label

approved this merge request

added MRStatus::Acceptable label and removed MRStatus::Reviewable label

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

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added 38 commits

• 232829e6...4e67a7c0 - 36 commits from branch videolan:master
• b4305905 - CI: Bump vlc-debian-win64 image tag
• a598e4e5 - tools: Require meson 0.56+

Compare with previous version

enabled an automatic merge when the pipeline for a598e4e5 succeeds

merged