Update and dependencies 1318

[wtgee]

Adds a pocs update command that will fetch the latest changes from github, sync the dependencies (using hatch) and show any relevant messsages to the user.

Closes #1318

Messages are shown to the user by adding a notice as follows:

NOTICE: Now you can easily update POCS by calling pocs update. Give it a try! 🎉

[Copilot]

Pull Request Overview

This PR adds a new pocs update command to automatically update the POCS project by fetching the latest changes from GitHub, syncing dependencies using hatch, and displaying relevant update messages to users.

• Implements pocs update command with git operations and progress tracking
• Adds utility functions for finding project root and running hatch commands
• Simplifies dependency management by consolidating optional dependencies

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
src/panoptes/pocs/utils/cli/main.py	Adds update command implementation with git operations, message display, and dependency management functions
pyproject.toml	Adds GitPython dependency and simplifies optional dependency groups

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