python3Packages.executor: migrate to pyproject and fix for python3.13+

[Ambossmann]

• Moving format to pyproject #515974
• There a multiple open PRs upstream to fix compatibility with python 3.13, the diff used here is taken from Fix Python 3.13 compatibility by replacing pipes with shlex xolox/python-executor#26

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.
• Follows the automation/AI policy.

[Ambossmann]

nixpkgs-review result

Generated using nixpkgs-review-gha

Command: nixpkgs-review pr 528079
Commit: a3783c59897789dd491dbbd5c5329aac1ba28b5a (subsequent changes)
Merge: 1fedd066863a62177411f77ba5da5e5b0146b09e

Logs: https://github.com/Ambossmann/nixpkgs-review-gha/actions/runs/26973958119

---

x86_64-linux

✅ 5 packages built:

• executor (python313Packages.executor)
• update-dotdee (python313Packages.update-dotdee)
• python314Packages.executor
• python314Packages.update-dotdee
• rotate-backups

---

aarch64-linux

✅ 5 packages built:

• executor (python313Packages.executor)
• update-dotdee (python313Packages.update-dotdee)
• python314Packages.executor
• python314Packages.update-dotdee
• rotate-backups

---

aarch64-darwin (sandbox = relaxed)

✅ 5 packages built:

• executor (python313Packages.executor)
• update-dotdee (python313Packages.update-dotdee)
• python314Packages.executor
• python314Packages.update-dotdee
• rotate-backups