ImportError on Python 3.10: cannot import UTC from datetime

[JoeCardoso13]

Bug

Running the echo bundle on Python 3.10 fails with:

ImportError: cannot import name 'UTC' from 'datetime' (/usr/lib/python3.10/datetime.py)

Cause

datetime.UTC was introduced in Python 3.11. The import in server.py line 7:

from datetime import UTC, datetime

should be changed to use datetime.timezone.utc for compatibility with Python 3.10+.

Reproduction

mpak run @nimblebraininc/echo

on a system with Python 3.10.