Update flask to 2.2.4

[pyup-bot]

This PR updates flask from 2.2.2 to 2.2.4.

Changelog

2.2.4

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Released 2023-04-25

-   Update for compatibility with Werkzeug 2.3.

2.2.3

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Released 2023-02-15

-   Autoescape is enabled by default for ``.svg`` template files. :issue:`4831`
-   Fix the type of ``template_folder`` to accept ``pathlib.Path``. :issue:`4892`
-   Add ``--debug`` option to the ``flask run`` command. :issue:`4777`

Links

• PyPI: https://pypi.org/project/flask
• Changelog: https://pyup.io/changelogs/flask/
• Homepage: https://palletsprojects.com/p/flask

[pyup-bot]

Closing this in favor of #301