Remove backport of datetime functions

This is no longer needed as python <3.11 is not supported anymore

pyproject.toml

@@ -29,7 +29,6 @@ classifiers = [
 dynamic = ["version"]
 dependencies = [
     "aiohttp",
-    "backports-datetime_fromisoformat; python_version < '3.11'",
     "cryptography",
     "dnspython >= 2",
     "fastapi",

src/ert/ensemble_evaluator/snapshot.py

@@ -1,5 +1,4 @@
 import logging
-import sys
 import typing
 from collections import defaultdict
 from datetime import datetime
@@ -49,11 +48,6 @@
 
 logger = logging.getLogger(__name__)
 
-if sys.version_info < (3, 11):
-    from backports.datetime_fromisoformat import MonkeyPatch  # type: ignore
-
-    MonkeyPatch.patch_fromisoformat()
-
 
 class UnsupportedOperationException(ValueError):
     pass

src/ert/gui/model/snapshot.py

@@ -1,5 +1,4 @@
 import logging
-import sys
 from collections import defaultdict
 from contextlib import ExitStack
 from datetime import datetime, timedelta
@@ -26,11 +25,6 @@
 )
 from ert.shared.status.utils import byte_with_unit, file_has_content
 
-if sys.version_info < (3, 11):
-    from backports.datetime_fromisoformat import MonkeyPatch  # type: ignore
-
-    MonkeyPatch.patch_fromisoformat()
-
 logger = logging.getLogger(__name__)
 
 UserRole = Qt.ItemDataRole.UserRole