Update dependency flask-babel to v4 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flask-babel	^2.0.0 -> ^2.0.0 || ^4.0.0

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Release Notes

python-babel/flask-babel (flask-babel)

v4.0.0

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• Dropped support for end-of-life Python 3.7. Support PyPy 3.9
• Replace deprecated locked_cached_property decorator with cached_property (#​230)

v3.1.0

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• Documentation and packaging improvements. (#​226, #​223, #​218, #​217, #​215)
• Don't return the default locale twice (#​219)
• Fix tests breaking against babel 12.2, which changed localized times to use non-breaking-spaces. Babel 12.2 or greater
  is now required. (#​222)
• Relax version requirements for dependencies. (#​227, #​225)

v3.0.1: Bugfix Release

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Small bugfix for the get_locale() behaviour when the default locale is returned.

v3.0.0

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Major version bump as this version removes support for Python 3.5 and 3.6, along with multiple
major breaking changes. Hope you've been following SemVer :)

• Dropped support for end-of-life Python 3.5 and 3.6, added tests for 3.10 and 3.11.
• Fixes to documentation to address outdated links and settings (#​204, 201)
• Jinja version 3 or greater is now required (released 2021)
• Removed Babel._date_formats, use the public Babel.date_formats instead.
• list_translations() always returns the default locale, even if it does not exist. (#​75)
• Add lazy_npgettext() (#​68)
• Babel.locale_selector and Babel.timezone_selector no longer exist. They must be provided
  either when the Babel() object is created or when init_app() is called. This is to support
  having a single Babel object for multiple Flask apps (#​107) as well as to simplify settings
  and multi-threaded state.
• Most configuration options can be passed directly through init_app().

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