enable mypy_test for python 3.10 (#5341)

* enable mypy_test for python 3.10

* avoid collections.Mapping and collections.MutableMapping, import from typing

stubs/MarkupSafe/markupsafe/__init__.pyi

@@ -1,7 +1,6 @@
 import string
 import sys
-from collections import Mapping
-from typing import Any, Callable, Iterable, List, Optional, Sequence, Text, Tuple, Union
+from typing import Any, Callable, Iterable, List, Mapping, Optional, Sequence, Text, Tuple, Union
 
 from markupsafe._compat import text_type
 from markupsafe._native import escape as escape, escape_silent as escape_silent, soft_unicode as soft_unicode

stubs/paramiko/paramiko/hostkeys.pyi

@@ -1,10 +1,8 @@
-import collections
-import typing
-from typing import Dict, Iterator, List, Optional
+from typing import Any, Dict, Iterator, List, MutableMapping, Optional
 
 from paramiko.pkey import PKey
 
-class _SubDict(typing.MutableMapping[str, PKey]):
+class _SubDict(MutableMapping[str, PKey]):
     # Internal to HostKeys.lookup()
     def __init__(self, hostname: str, entries: List[HostKeyEntry], hostkeys: HostKeys) -> None: ...
     def __iter__(self) -> Iterator[str]: ...
@@ -14,7 +12,7 @@ class _SubDict(typing.MutableMapping[str, PKey]):
     def __setitem__(self, key: str, val: PKey) -> None: ...
     def keys(self) -> List[str]: ...  # type: ignore
 
-class HostKeys(collections.MutableMapping):
+class HostKeys(MutableMapping[Any, Any]):
     def __init__(self, filename: Optional[str] = ...) -> None: ...
     def add(self, hostname: str, keytype: str, key: PKey) -> None: ...
     def load(self, filename: str) -> None: ...

stubs/requests/requests/packages/urllib3/_collections.pyi

@@ -1,5 +1,4 @@
-from collections import MutableMapping
-from typing import Any, NoReturn, TypeVar
+from typing import Any, MutableMapping, NoReturn, TypeVar
 
 _KT = TypeVar("_KT")
 _VT = TypeVar("_VT")