nix: crane emitting a warning about version field

[colemickens]

Summary

Hi, I'm seeing this in my builds:

trace: warning: crane will use a placeholder value since `version` cannot be found in /nix/store/5ra9k4mi6a0ff2vgbhwc3pf1ja4sxll2-Cargo.toml
to silence this warning consider one of the following:
- setting `version = "...";` in the derivation arguments explicitly
- setting `package.version = "..."` or `workspace.package.version = "..."` in the root Cargo.toml
- explicitly looking up the values from a different Cargo.toml via
  `craneLib.crateNameFromCargoToml { cargoToml = ./path/to/Cargo.toml; }`

To find the source of this warning, rerun nix with:
`NIX_ABORT_ON_WARN=1 nix --option pure-eval false --show-trace ...`

cracking on the Cargo.toml shown indicates it's likely coming from Helix.

Reproduction Steps

Build the flake currently.

Helix log

n/a

Platform

Nix (NixOS)

Terminal Emulator

n/a, but alacritty/rio/wezterm

Installation Method

flake-in-tree

Helix Version

b81aacc (from flake.lock)