Bug: Version only works for rust

[Bakobiibizo]

Issue: dev version show and dev version bump look for Cargo.toml. Add language check from the set language.
Steps to reproduce:

1. Set language to python
   dev language set ptyhon
2. Run dev version show

bakobi@tang-home-100:~/repos/video/derivata-3$ dev version show
Error: reading /repos/video/derivata-3/Cargo.toml

Caused by:
    No such file or directory (os error 2)

Expected results: That the package would look for pyproject.toml and parse the version from there.

Same issue for version bump