chg: Use python 3.9+ syntax

Author: Rafiot

har2tree/helper.py

@@ -13,7 +13,8 @@
 from collections import defaultdict
 from io import BytesIO
 from logging import LoggerAdapter
-from typing import Mapping, MutableMapping, Any
+from typing import Any
+from collections.abc import Mapping, MutableMapping
 from urllib.parse import urlparse, unquote_plus, unquote_to_bytes, urljoin
 
 import filetype  # type: ignore

har2tree/nodes.py

@@ -18,7 +18,8 @@
 from hashlib import sha256
 from io import BytesIO
 from pathlib import Path
-from typing import MutableMapping, Any
+from typing import Any
+from collections.abc import MutableMapping
 from urllib.parse import unquote_plus, urlparse, urljoin
 
 import filetype  # type: ignore

har2tree/parser.py

@@ -6,7 +6,7 @@
 import copy
 from datetime import datetime
 from collections import defaultdict
-from typing import Iterable
+from collections.abc import Iterable
 import logging
 from .har2tree import Har2Tree
 from .nodes import URLNode