Update dependency flask to v3.1.1 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flask (changelog)	==3.1.0 -> ==3.1.1

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Release Notes

pallets/flask (flask)

v3.1.1

Compare Source

Released 2025-05-13

• Fix signing key selection order when key rotation is enabled via
  SECRET_KEY_FALLBACKS. :ghsa:4grg-w6v8-c28g
• Fix type hint for cli_runner.invoke. :issue:5645
• flask --help loads the app and plugins first to make sure all commands
  are shown. :issue:5673
• Mark sans-io base class as being able to handle views that return
  AsyncIterable. This is not accurate for Flask, but makes typing easier
  for Quart. :pr:5659

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Summary by Sourcery

Bump Flask dependency to v3.1.1

Bug Fixes:

• Fix signing key selection order when key rotation is enabled via SECRET_KEY_FALLBACKS
• Fix type hint for cli_runner.invoke
• Ensure flask --help loads the app and plugins to display all commands

Enhancements:

• Mark sans-io base class as handling AsyncIterable return types for improved typing

[sourcery-ai]

Reviewer's Guide

This PR upgrades the Flask dependency from v3.1.0 to v3.1.1 in the project requirements to incorporate recent bug fixes and improvements.

File-Level Changes

Change	Details	Files
Bump Flask version in requirements	Changed Flask version specifier from 3.1.0 to 3.1.1 in requirements.txt	requirements.txt

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