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fix(deps): update dependency flask to v3.1.2

RENOVATE_BOT requested to merge renovate/flask-3.x into master

This MR contains the following updates:

Package Change Age Confidence
flask (changelog) 3.0.0 -> 3.1.2 age confidence

Release Notes

pallets/flask (flask)

v3.1.2

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Released 2025-08-19

  • stream_with_context does not fail inside async views. :issue:5774
  • When using follow_redirects in the test client, the final state of session is correct. :issue:5786
  • Relax type hint for passing bytes IO to send_file. :issue:5776

v3.1.1

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Released 2025-05-13

  • Fix signing key selection order when key rotation is enabled via SECRET_KEY_FALLBACKS. :ghsa:4grg-w6v8-c28g
  • Fix type hint for cli_runner.invoke. :issue:5645
  • flask --help loads the app and plugins first to make sure all commands are shown. :issue:5673
  • Mark sans-io base class as being able to handle views that return AsyncIterable. This is not accurate for Flask, but makes typing easier for Quart. 🇵🇷5659

v3.1.0

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Released 2024-11-13

  • Drop support for Python 3.8. 🇵🇷5623
  • Update minimum dependency versions to latest feature releases. Werkzeug >= 3.1, ItsDangerous >= 2.2, Blinker >= 1.9. 🇵🇷5624,5633
  • Provide a configuration option to control automatic option responses. 🇵🇷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. 🇵🇷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:5336
  • Fix a typo in an error message for the flask run --key option. 🇵🇷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. 🇵🇷5383

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