fix: Fix import errors introduced in CronTrigger feature (#1649)

Add croniter to requirements.txt, and change the import of the stub-only `datetime._TzInfo` to only run when type checking

Author: silasary

interactions/models/internal/tasks/triggers.py

@@ -1,5 +1,9 @@
+import typing
 from abc import ABC, abstractmethod
-from datetime import datetime, timedelta, timezone, _TzInfo
+from datetime import datetime, timedelta, timezone
+
+if typing.TYPE_CHECKING:
+    from datetime import _TzInfo
 
 from croniter import croniter
 
@@ -154,7 +158,7 @@ class CronTrigger(BaseTrigger):
 
     """
 
-    def __init__(self, cron: str, tz: _TzInfo = timezone.utc) -> None:
+    def __init__(self, cron: str, tz: "_TzInfo" = timezone.utc) -> None:
         self.cron = cron
         self.tz = tz
 

requirements.txt

@@ -1,5 +1,6 @@
 aiohttp
 attrs>=22.1
+croniter
 discord-typings>=0.5.1
 emoji
 tomli