python3Packages.docling-serve: remove dependency on unavailable mlx-vlm

[sarahec]

docling-serve fails to build with:

       > Checking runtime dependencies for docling_serve-0.11.0-py3-none-any.whl
       >   - mlx-vlm not installed

mlx-vlm is a Darwin-specific module that is not yet in nixpkgs. This disables the dependency.

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/)
• Nixpkgs 25.11 Release Notes (or backporting 25.05 Nixpkgs Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
• NixOS 25.11 Release Notes (or backporting 25.05 NixOS Release notes)
  • (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, pkgs/README.md, maintainers/README.md and other contributing documentation in corresponding paths.

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[sarahec]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 422844
Commit: 0a95d6d9a7ddb7bacb08be3b7dfc6cbf802adebc

---

aarch64-darwin

✅ 4 packages built:

• docling-serve (python313Packages.docling-serve)
• docling-serve.dist (python313Packages.docling-serve.dist)
• python312Packages.docling-serve
• python312Packages.docling-serve.dist

[sarahec]

Close before #422747