Rely on compay.get_args instead of adding dependency

pyproject.toml

@@ -40,7 +40,6 @@ numpy = [
     { version = ">1.22.0", markers = "python_version ~= '3.10' and (extra == 'numpy' or extra == 'all')", optional = true },
 ]
 orjson = { version = "*", markers = "extra == 'orjson' or extra == 'all'", optional = true }
-typing-utils = { version = "*", markers = "python_version < '3.8'" }
 
 [tool.poetry.dev-dependencies]
 pyyaml = "*"

serde/de.py

@@ -12,12 +12,6 @@
 from dataclasses import dataclass, is_dataclass
 from typing import Any, Callable, Dict, List, Optional, TypeVar
 
-if sys.version_info[1] < 8:
-    # get_args was added in python 3.8
-    from typing_utils import get_args
-else:
-    from typing import get_args
-
 import jinja2
 from typing_extensions import Type, dataclass_transform
 
@@ -27,6 +21,7 @@
     SerdeSkip,
     UserError,
     find_generic_arg,
+    get_args,
     get_generic_arg,
     get_origin,
     has_default,