beautysh: patch "poetry" reference in pyproject.toml

[tjni]

Description of changes

Pull in lovesegfault/beautysh#247, which I submitted upstream. The build-backend path was already correct, but the leftover reference to "poetry" instead of "poetry-core" fails the build when build is used.

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/)
• 23.11 Release Notes (or backporting 23.05 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
• Fits CONTRIBUTING.md.

[fabaff]

Result of nixpkgs-review pr 248598 run on x86_64-linux 1

2 packages failed to build:

• python311Packages.mdformat-beautysh
• python311Packages.mdformat-beautysh.dist

4 packages built:

• beautysh
• beautysh.dist
• python310Packages.mdformat-beautysh
• python310Packages.mdformat-beautysh.dist

[fabaff]

mdformat-beautysh failure will be fixed with #248677.