Bump pyee from 13.0.1 to 14.0.0 in /backend

[dependabot]

Bumps pyee from 13.0.1 to 14.0.0.

Release notes

Sourced from pyee's releases.

Release v14.0.0

2026/08/12 Version 14.0.0

• Use uv instead of pip-tools
• Move dev extras to dev dependency group
• Drop support for Python 3.8, 3.9, 3.10 and 3.11
• BUGFIX: Remove all listeners only for specified event

Changelog

Sourced from pyee's changelog.

2026/08/12 Version 14.0.0

• Use uv instead of pip-tools
• Move dev extras to dev dependency group
• Drop support for Python 3.8, 3.9, 3.10 and 3.11
• BUGFIX: Remove all listeners only for specified event

Commits

• 733143c Update docs config
• 433f1b0 Release 14.0.0
• 426cd82 Remove redundant remove_all_listeners single-event regression test
• 41f2cb8 Fix remove_all_listeners leaving stale empty event key
• 5980b92 Bump tornado from 6.5.5 to 6.5.7
• aebd21f Bump idna from 3.11 to 3.15
• 221ec5d Bump pymdown-extensions from 10.21 to 10.21.3
• c2266f9 Bump urllib3 from 2.6.3 to 2.7.0
• 033853a Bump pytest from 9.0.2 to 9.0.3
• 06536f0 Bump pygments from 2.19.2 to 2.20.0
• Additional commits viewable in compare view

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[zmustafa]

Shipped in 1333b77 (pushed to main), so this PR is superseded. Applied together and validated as a set: pip check clean, backend 5696 passed / 16 skipped / 523 deselected / 8 xfailed, npm ci clean, npm audit 0 vulnerabilities, frontend production build passed.

[dependabot]

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