python3Packages.myst-parser: relax docutils constraint

[flokli]

Two failing tests that expect some autogenerated URLs to use http, while
the use https. Also an old path to python peps was replaced with a new
path.

Cherry-picked from ad6dd34.

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/)
• 22.11 Release Notes (or backporting 22.05 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.

[mweinelt]

Similar fix, that does not require carrying a patch. NixOS/nixpkgs@ad6dd34 (#185037)

[flokli]

Makes sense. Should I cherry-pick this into here instead, or do you expect #185037 to be ready to merge soon?

[mweinelt]

Feel free to pick it, if you want it now.