chore(deps): bump flask from 2.3.3 to 3.0.0 in /tests/apps/multi

[dependabot]

Bumps flask from 2.3.3 to 3.0.0.

Release notes

Sourced from flask's releases.

3.0.0

This is a feature release, which includes new features, removes previously deprecated code, and adds new deprecations. The 3.0.x branch is now the supported fix branch, the 2.3.x branch will become a tag marking the end of support for that branch. We encourage everyone to upgrade, and to use a tool such as pip-tools to pin all dependencies and control upgrades. Test with warnings treated as errors to be able to adapt to deprecation warnings early.

• Changes: https://flask.palletsprojects.com/en/3.0.x/changes/#version-3-0-0
• Milestone: https://github.com/pallets/flask/milestone/20?closed=1

Changelog

Sourced from flask's changelog.

Version 3.0.0

Released 2023-09-30

• Remove previously deprecated code. :pr:5223
• Deprecate the __version__ attribute. Use feature detection, or importlib.metadata.version("flask"), instead. :issue:5230
• Restructure the code such that the Flask (app) and Blueprint classes have Sans-IO bases. :pr:5127
• Allow self as an argument to url_for. :pr:5264
• Require Werkzeug >= 3.0.0.

Commits

• 735a470 Release version 3.0.0
• efe39ae Bump Werkzeug 3.0.0
• 438edcd Allow self as an argument to url_for
• b7c1290 Fix wrong spelling of JS method .innerHTML
• 8037487 Bump pypa/gh-action-pypi-publish from 1.8.8 to 1.8.10 (#5248)
• e8076d9 Bump slsa-framework/slsa-github-generator from 1.7.0 to 1.9.0 (#5247)
• ecc4a38 Bump actions/checkout from 3.5.3 to 3.6.0 (#5246)
• 24c6508 Bump pypa/gh-action-pypi-publish from 1.8.8 to 1.8.10
• 98cef9f Bump slsa-framework/slsa-github-generator from 1.7.0 to 1.9.0
• 0c97a41 Bump actions/checkout from 3.5.3 to 3.6.0
• Additional commits viewable in compare view

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