Update flask-socketio requirement from <6.0,>=5.3 to >=5.6.1,<6.0

[dependabot]

Updates the requirements on flask-socketio to permit the latest version.

Release notes

Sourced from flask-socketio's releases.

Release 5.6.1

See CHANGES.md for release notes.

Changelog

Sourced from flask-socketio's changelog.

Flask-SocketIO change log

Release 5.6.1 - 2026-02-21

• Session fixes for Flask >= 3.1.3 #2153 (commit)
• Update SocketIO constructor documentation #2151 (commit)
• Switch to the Furo documentation template (commit)

Release 5.6.0 - 2025-12-25

• Use Flask test client's own environ dict if it is available #2142 (commit)
• Add Python 3.13, 3.14 and pypy-3.11 to CI builds, drop 3.8 and 3.9 (commit)
• Documentation: Added an example using the init_app() method #2110 (commit)

Release 5.5.1 - 2025-01-06

• Updated version of python-socketio dependency #2128 (commit) (thanks Okke Harsta!)

Release 5.5.0 - 2024-12-18

• Add a reason argument to the disconnect handler (commit)
• Upgrade the code to more recent Python versions ([commit #1](miguelgrinberg/Flask-SocketIO@6a6734f) [commit #2](miguelgrinberg/Flask-SocketIO@c3667e8))
• Remove misleading warning about use of gevent-websocket in the documentation #2122 (commit)
• fix typo in deployment documentation #2119 (commit) (thanks Maximilien Tirard!)

Release 5.4.1 - 2024-10-01

• Removed a debugging statement (commit)

Release 5.4.0 - 2024-09-30

• Support catch-all events with socketio.on('*') #2095 (commit)

Release 5.3.7 - 2024-09-02

• Prevent crash when client sends empty event (commit)
• Handle events with catch-all namespace #2061 (commit)
• Add unit test for background tasks (commit)
• Drop Python 3.7, add Python 3.12, upgrade to pypy 3.10 (commit)

Release 5.3.6 - 2023-09-05

• Fixes in the test client to support recent changes in Socket.IO dependencies #2006 (commit)

Release 5.3.5 - 2023-07-26

• Prevent allow_unsafe_werkzeug option from being passed to web servers #2001 (commit)

Release 5.3.4 - 2023-05-03

... (truncated)

Commits

• 9e18242 Release 5.6.1
• 1f547c4 Update SocketIO constructor documentation (Fixes #2151)
• ece8afc Switch to Furo documentation template
• 956f8f2 Session fixes for Flask >= 3.1.3 (#2153)
• 325c2d4 Version 5.6.1.dev0
• e24a2f8 Release 5.6.0
• ccb9a75 Use Flask test client's own environ dict if available (Fixes #2142)
• e05f135 linter fixes #nolog
• 1ad7940 Add Python 3.13, 3.14 and pypy-3.11, drop 3.8 and 3.9
• 78dda9b Added an example using the init_app() method (Fixes #2110)
• Additional commits viewable in compare view

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