Update dependency flask to v3.1.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flask (changelog)	3.0.0 -> 3.1.0

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Release Notes

pallets/flask (flask)

v3.1.0

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Released 2024-11-13

• Drop support for Python 3.8. :pr:5623
• Update minimum dependency versions to latest feature releases.
  Werkzeug >= 3.1, ItsDangerous >= 2.2, Blinker >= 1.9. :pr:5624,5633
• Provide a configuration option to control automatic option
  responses. :pr:5496
• Flask.open_resource/open_instance_resource and
  Blueprint.open_resource take an encoding parameter to use when
  opening in text mode. It defaults to utf-8. :issue:5504
• Request.max_content_length can be customized per-request instead of only
  through the MAX_CONTENT_LENGTH config. Added
  MAX_FORM_MEMORY_SIZE and MAX_FORM_PARTS config. Added documentation
  about resource limits to the security page. :issue:5625
• Add support for the Partitioned cookie attribute (CHIPS), with the
  SESSION_COOKIE_PARTITIONED config. :issue:5472
• -e path takes precedence over default .env and .flaskenv files.
  load_dotenv loads default files in addition to a path unless
  load_defaults=False is passed. :issue:5628
• Support key rotation with the SECRET_KEY_FALLBACKS config, a list of old
  secret keys that can still be used for unsigning. Extensions will need to
  add support. :issue:5621
• Fix how setting host_matching=True or subdomain_matching=False
  interacts with SERVER_NAME. Setting SERVER_NAME no longer restricts
  requests to only that domain. :issue:5553
• Request.trusted_hosts is checked during routing, and can be set through
  the TRUSTED_HOSTS config. :issue:5636

v3.0.3

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Released 2024-04-07

• 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.
  :issue:5448
• Don't initialize the cli attribute in the sansio scaffold, but rather in
  the Flask concrete class. :pr:5270

v3.0.2

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Released 2024-02-03

• Correct type for jinja_loader property. :issue:5388
• Fix error with --extra-files and --exclude-patterns CLI options.
  :issue:5391

v3.0.1

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Released 2024-01-18

• Correct type for path argument to send_file. :issue:5230
• Fix a typo in an error message for the flask run --key option. :pr:5344
• Session data is untagged without relying on the built-in json.loads
object_hook. This allows other JSON providers that don't implement that.
  :issue:5381
• Address more type findings when using mypy strict mode. :pr:5383

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