Upgrade dependency flask-caching to v2.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flask-caching (changelog)	==2.3.1 → ==2.4.0

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Release Notes

pallets-eco/flask-caching (flask-caching)

v2.4.0

Compare Source

2026-04-17

• Modernize project setup
• Update intersphinx_mapping for Sphinx 8 compatibility. :pr:599, :issue:598
• Pass CACHE_OPTIONS as kwargs to redis_from_url. :pr:591
• Pass sentinel_kwargs to redis client via CACHE_OPTIONS :pr:626
• Fix response_hit_indication return True always. :pr:579, :pr:596, :issue:595, :issue:570

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