harfbuzz: 5.3.1 -> 6.0.0

[2xsaiko]

Description of changes

Update HarfBuzz to version 6.0.0.

Closes #180054.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.05 Release Notes (or backporting 22.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[risicle]

passthru.tests build successfully on aarch64-linux apart from already-broken mapnik

[2xsaiko]

Tests also build successfully on x86_64-linux and aarch64-darwin (including mapnik).

[alerque]

Is there anything in particular holding up this PR? We use Nix for a lot of things upstream at the SILE project and our next release milestone supporting variable fonts is a bit held up because we can't run CI tests remotely or rebuild our website examples easily without Nix support for HarfBuzz 6!

Also as a point of reference as an avid Arch Linux user I can report that the entire distro switched to 6.x pretty painlessly. There is no known breakage moving up from older releases.

[risicle]

This will need to be re-targeted at staging using the technique described in https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md#rebasing-between-branches-ie-from-master-to-staging

[alerque]

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