Update dependency Flask to v2.3.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Flask (changelog)	==2.3.0 -> ==2.3.3
flask (changelog)	==2.3.0 -> ==2.3.3

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Release Notes

pallets/flask (Flask)

v2.3.3

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Released 2023-08-21

• Python 3.12 compatibility.
• Require Werkzeug >= 2.3.7.
• Use flit_core instead of setuptools as build backend.
• Refactor how an app's root and instance paths are determined. :issue:5160

v2.3.2

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Released 2023-05-01

• Set Vary: Cookie header when the session is accessed, modified, or refreshed.
• Update Werkzeug requirement to >=2.3.3 to apply recent bug fixes.
  :ghsa:m2qf-hxjv-5gpq

v2.3.1

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Released 2023-04-25

• Restore deprecated from flask import Markup. :issue:5084

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