sherlock: fix build

[dtomvan]

Removes the poetry dependency in nativeCheckInputs, as poetry-core
suffices. poetry has 4 tests failing right now, which is the next thing I'll
take a look at.

Hydra build: https://hydra.nixos.org/build/295980258

ZHF: #403336

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• 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/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 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.

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review rev HEAD

---

x86_64-linux

✅ 6 packages built:

• dialect
• lambdabot
• lambdabot.data
• lambdabot.doc
• sherlock
• sherlock.dist

---

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nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 403611

---

x86_64-linux

✅ 2 packages built:

• sherlock
• sherlock.dist