Switch to backports for iso8601 for python3.10

Switch to backports for iso8601 for python3.10 instead of ciso8601

requirements.txt

@@ -1,3 +1,3 @@
 aiohttp>=3.9.1,<4
 typing_extensions>=4.1.0
-ciso8601; python_version < '3.11'
+backports.datetime_fromisoformat>=2.0.1

twitchio/utils.py

@@ -6,6 +6,10 @@
 from datetime import datetime
 from typing import Any
 
+from backports.datetime_fromisoformat import MonkeyPatch  # type: ignore
+
+
+MonkeyPatch.patch_fromisoformat()  # type: ignore
 
 try:
     import orjson  # type: ignore
@@ -14,17 +18,6 @@
 except ImportError:
     _from_json = json.loads
 
-try:
-    from ciso8601 import parse_datetime as parse_iso
-except ImportError:
-    from datetime import timezone
-
-    def parse_iso(datetime_string: str) -> datetime:
-        dt = datetime.fromisoformat(datetime_string)
-        dt = dt.replace(tzinfo=timezone.utc) if dt.tzinfo is None else dt.astimezone(timezone.utc)
-        return dt
-
-
 __all__ = ("_from_json", "setup_logging", "ColourFormatter", "ColorFormatter", "parse_timestamp")
 
 
@@ -64,8 +57,7 @@ def stream_supports_rgb(stream: Any) -> bool:
 
 def parse_timestamp(timestamp: str) -> datetime:
     """
-    Parses a timestamp in ISO8601 format to a datetime object using either
-    ciso8601.parse_datetime or datetime.fromisoformat based on availability.
+    Parses a timestamp in ISO8601 format to a datetime object.
 
     Parameters
     ----------
@@ -77,7 +69,7 @@ def parse_timestamp(timestamp: str) -> datetime:
     datetime.datetime
         The parsed datetime object.
     """
-    return parse_iso(timestamp)
+    return datetime.fromisoformat(timestamp)
 
 
 class ColourFormatter(logging.Formatter):