refactor: Use datetime.timezone.utc instead of pytz.UTC where pos…

…sible

.gitignore

@@ -1,3 +1,7 @@
+# Local Poetry configuration file
+
+poetry.toml
+
 # CI
 
 _changelog_fragment.md

pyproject.toml

@@ -214,7 +214,6 @@ fail_under = 82
 [tool.mypy]
 exclude = "tests"
 files = "singer_sdk"
-python_version = "3.8"
 warn_redundant_casts = true
 warn_return_any = true
 warn_unused_configs = true

singer_sdk/_singerlib/utils.py

@@ -1,9 +1,7 @@
 from __future__ import annotations
 
 import sys
-from datetime import datetime, timedelta
-
-import pytz
+from datetime import datetime, timedelta, timezone
 
 if sys.version_info < (3, 11):
     from backports.datetime_fromisoformat import MonkeyPatch
@@ -33,9 +31,9 @@ def strptime_to_utc(dtimestr: str) -> datetime:
     """
     d_object: datetime = datetime.fromisoformat(dtimestr)
     if d_object.tzinfo is None:
-        return d_object.replace(tzinfo=pytz.UTC)
+        return d_object.replace(tzinfo=timezone.utc)
 
-    return d_object.astimezone(tz=pytz.UTC)
+    return d_object.astimezone(tz=timezone.utc)
 
 
 def strftime(dtime: datetime, format_str: str = DATETIME_FMT) -> str: