fix(py/handlebarrz): remove redundant lock file (#360)

RATIONALE:

It appears that there is a redundant lock file in
python/handlebarrz/uv.lock file. However, running
`uv sync` doesn't appear to make any changes to the file.
uv manages lock files at the workspace level so it
appears to be safe to delete this file.

CHANGELOG:
- [ ] Remove the uv.lock file from the project-specific
      directory and use the workspace one.

Author: yesudeep