Weston: 1.12.0 -> 3.0.0; wayland: 1.12.0 -> 1.14.0

[Mic92]

Motivation for this change

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[dezgeg]

This rebuilds Mesa I think, and that's typically taken through staging.

[Mic92]

it is already set up for staging.

[dezgeg]

Oops, I was blind apparently...