feat: Change Gunicorn worker class to standard ASGI

[YoshihitoAso]

📌 Description

• Update the Gunicorn dependency, and remove uvicorn
• Use the Gunicorn standard ASGI worker.

✅ Related Issues

None

🔄 Changes

Dependency and configuration changes:

• Upgraded gunicorn from version 23.0.0 to 24.1.0 in pyproject.toml.
• Removed the uvicorn dependency from pyproject.toml, indicating a shift away from using Uvicorn as a Gunicorn worker.

Server startup and worker changes:

• Deleted the custom AppUvicornWorker class and all related code from server.py, removing the custom Gunicorn worker implementation.
• Changed the Gunicorn startup command to use the standard asgi worker class instead of the removed custom worker.

Version and documentation updates:

• Bumped the project version from 25.12 to 26.3.

📌 Checklist

• I have added tests where necessary.
• I have updated the documentation where necessary.

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
app
__init__.py	1	0	100%
main.py	135	20	85%	108–109, 113, 118–120, 149–150, 193, 205–207, 218–220, 223, 227, 232, 236, 378
TOTAL	46983	1576	96%

Tests	Skipped	Failures	Errors	Time
1538	0 💤	0 ❌	0 🔥	12m 12s ⏱️