invoice2data: clean up some build and runtime dependencies

[tjni]

Description of changes

This change does the following:

1. Pull in a patch to remove unnecessary pip and pytest-runner dependencies in setup.cfg.
2. Move setuptools-git into nativeBuildInputs, where it belongs.
3. Remove chardet, which was removed in Treat all YAML templates files as UTF-8 encoded invoice-x/invoice2data#449.
4. Remove setuptools, which is not needed at runtime.
5. Remove unidecode, which was removed in [REM] unidecode library invoice-x/invoice2data#436.

This package has an updated version (version 0.4.4), but I don't feel prepared to update it yet. It's also nontrivial to get the tests working again, so I've skipped doing that in this PR.

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.