Add a Cargo.lock file

[DanielNoord]

For #148 it seems some Cargo.lock files were removed, but with the new project structure of >= 2.9.x there is no longer a Cargo.lock file anywhere within the project.
This actually makes the package quite hard to package on downstream packagers as those tend to require a lock file.

See the relevant section in the nix guidelines:
https://github.com/NixOS/nixpkgs/blob/master/doc/languages-frameworks/rust.section.md

Would it be possible to add a top-level Cargo.lock file again and do a release so we could package a version that supports Python 3.13 but is also packagable by the default infrastructure in nix?

[milesgranger]

Released v2.9.1
Thanks for informing me about this.

[DanielNoord]

Awesome, appreciate the quick fix!