Update dependency flask to v3.0.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flask (changelog)	3.0.2 -> 3.0.3

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Release Notes

pallets/flask (flask)

v3.0.3

Compare Source

This is a fix release for the 3.0.x feature branch.

PyPI: https://pypi.org/project/Flask/3.0.3/
Changes: https://flask.palletsprojects.com/en/3.0.x/changes/#version-3-0-3
Milestone: https://github.com/pallets/flask/milestone/35?closed=1

• The default hashlib.sha1 may not be available in FIPS builds. Don't access it at import time so the developer has time to change the default. #​5448
• Don't initialize the cli attribute in the sansio scaffold, but rather in the Flask concrete class. #​5270

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