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The FixedOffset and timezone imports were actually from pytz, which has been deprecated and therefore removed as a celery dependency. Instead, use zoneinfo in Python 3.9+ and backports.zoneinfo in earlier Python 3 versions to look up timezones by name, and use dateutil.timezone.utc and dateutil.timezone(timedelta(...)) to construct timezones that are a fixed offset from UTC.
For background and inspiration, see pganssle/pytz-deprecation-shim, but that is not necessary as a dependency for these uses.
Fixes #244.
This passes tests for me but I haven't run extensive experiments yet.