Revert "Update apscheduler==3.8.1"

This reverts commit 973cad264f.

lib/pytz_deprecation_shim/_compat_py3.py

@@ -1,58 +0,0 @@
-# Note: This file could use Python 3-only syntax, but at the moment this breaks
-# the coverage job on Python 2. Until we make it so that coverage can ignore
-# this file only on Python 2, we'll have to stick to 2/3-compatible syntax.
-try:
-    import zoneinfo
-except ImportError:
-    from backports import zoneinfo
-
-import datetime
-
-UTC = datetime.timezone.utc
-
-
-def get_timezone(key):
-    try:
-        return zoneinfo.ZoneInfo(key)
-    except (ValueError, OSError):
-        # TODO: Use `from e` when this file can use Python 3 syntax
-        raise KeyError(key)
-
-
-def get_timezone_file(f, key=None):
-    return zoneinfo.ZoneInfo.from_file(f, key=key)
-
-
-def get_fixed_offset_zone(offset):
-    return datetime.timezone(datetime.timedelta(minutes=offset))
-
-
-def is_imaginary(dt):
-    dt_rt = dt.astimezone(UTC).astimezone(dt.tzinfo)
-
-    return not (dt == dt_rt)
-
-
-def is_ambiguous(dt):
-    if is_imaginary(dt):
-        return False
-
-    wall_0 = dt
-    wall_1 = dt.replace(fold=not dt.fold)
-
-    # Ambiguous datetimes can only exist if the offset changes, so we don't
-    # actually have to check whether dst() or tzname() are different.
-    same_offset = wall_0.utcoffset() == wall_1.utcoffset()
-
-    return not same_offset
-
-
-def enfold(dt, fold=1):
-    if dt.fold != fold:
-        return dt.replace(fold=fold)
-    else:
-        return dt
-
-
-def get_fold(dt):
-    return dt.fold