Third-party stubs: import from collections.abc where possible (#7637)

stubs/dateparser/dateparser/languages/loader.pyi

@@ -1,5 +1,6 @@
 from collections import OrderedDict
-from typing import Any, Iterator
+from collections.abc import Iterator
+from typing import Any
 
 from .locale import Locale
 

stubs/dateparser/dateparser/utils/__init__.pyi

@@ -1,5 +1,6 @@
 from collections import OrderedDict
-from typing import Any, Mapping
+from collections.abc import Mapping
+from typing import Any
 
 def strip_braces(date_string: str) -> str: ...
 def normalize_unicode(string: str, form: str = ...) -> str: ...