feat(internal/librarian/python): bump snippet metadata versions

[jskeet]

Towards #3389

[jskeet]

@JoeWang1127 I'd expect you to be able to use basically the same code in the golang bump.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.01%. Comparing base (105fd65) to head (952b9a7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4030   +/-   ##
=======================================
  Coverage   82.01%   82.01%           
=======================================
  Files          77       77           
  Lines        6504     6504           
=======================================
  Hits         5334     5334           
  Misses        825      825           
  Partials      345      345           

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[gemini-code-assist]

Code Review

This pull request extends the Python version bumping logic to also update the version in snippet metadata files. While the core logic changes and test additions are good, a security audit identified critical vulnerabilities in internal/librarian/python/bump.go. A critical Command Injection vulnerability exists due to the unsanitized version parameter, allowing for potential Remote Code Execution. Furthermore, a high-severity Path Traversal vulnerability was found because the output parameter is not sanitized, which could allow an attacker to read or write files on the server. It is crucial to remediate these findings by properly sanitizing all external inputs, adhering to the principle of validating inputs at the point of use and sanitizing inputs for code generation templates to prevent injection vulnerabilities. Additionally, consider improving maintainability by avoiding hardcoded paths.

[jskeet]

Reopened - I only closed this accidentally, attempting to close something else :(