Update flask to 3.1.0

[pyup-bot]

This PR updates flask from 2.3.3 to 3.1.0.

Changelog

3.1.0

-------------

Unreleased

3.0.3

-------------

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`

3.0.2

-------------

Released 2024-02-03

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

3.0.1

-------------

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`

3.0.0

-------------

Released 2023-09-30

-   Remove previously deprecated code. :pr:`5223`
-   Deprecate the ``__version__`` attribute. Use feature detection, or
 ``importlib.metadata.version("flask")``, instead. :issue:`5230`
-   Restructure the code such that the Flask (app) and Blueprint
 classes have Sans-IO bases. :pr:`5127`
-   Allow self as an argument to url_for. :pr:`5264`
-   Require Werkzeug >= 3.0.0.

Links

• PyPI: https://pypi.org/project/flask
• Changelog: https://data.safetycli.com/changelogs/flask/

[pyup-bot]

Closing this in favor of #337