chore(deps): bump google-cloud-firestore

[lahirumaramba]

Update google-cloud-firestore requirement in requirements.txt from >= 2.27.0 to >= 2.28.0 for Python >= 3.10 environments, while preserving >= 2.27.0 for Python < 3.10 environments. This prevents dependency resolution errors on Python 3.9 where google-cloud-firestore 2.28.0 dropped support.

[gemini-code-assist]

Code Review

This pull request updates the google-cloud-firestore dependency in requirements.txt to apply different version constraints based on the Python version. The reviewer identifies a potential issue with using lexicographical string comparisons for Python version markers, which could cause incorrect dependency resolution in some environments. They suggest using specific equality checks (python_version != '3.9' and python_version == '3.9') to ensure robust behavior across all dependency parsers.

[gemini-code-assist]

Using python_version >= '3.10' and python_version < '3.10' can lead to unexpected behavior with older or alternative package managers, dependency parsers, and security scanners that incorrectly perform lexicographical string comparison instead of PEP 440 version comparison.

Specifically, under lexicographical comparison:

• '3.9' >= '3.10' evaluates to True (since '9' > '1'), which would incorrectly select the >= 2.28.0 requirement on Python 3.9.
• '3.9' < '3.10' evaluates to False, failing to select the >= 2.27.0 requirement on Python 3.9.

Since the minimum supported Python version for this project is 3.9 (as specified in setup.py), you can safely use python_version != '3.9' and python_version == '3.9' respectively. This is completely robust against any lexicographical string comparison bugs.

google-cloud-firestore >= 2.28.0; platform.python_implementation != 'PyPy' and python_version != '3.9'
google-cloud-firestore >= 2.27.0; platform.python_implementation != 'PyPy' and python_version == '3.9'