fix: add GitPython to dependencies list

[rt-slalom]

secureli-526

Add the GitPython package to our list of dependencies so that Poetry adds it on install.

Changes

• add gitpython to pyproject.toml
• regenerated lock file with updated gitpython version
• poetry install also made some updates to the extra optional dependencies in the lock file

Testing

Ran Secureli init after a clean install, it passed

Ran Poe Tests

Clean Code Checklist

• Meets acceptance criteria for issue
• New logic is covered with automated tests
• Appropriate exception handling added
• Thoughtful logging included
• Documentation is updated
• Follow-up work is documented in TODOs
• TODOs have a ticket associated with them
• No commented-out code included

[isaac-heist-slalom]

Looks good!