context_management: use ParamSpec from typing_extensions (#466)

context_management: use ParamSpec from typing_extensions

Python < 3.10 does not have ParamSpec, so we need to import it from typing_extensions.
Fixes #457

RELEASE NOTES BEGIN
The context_management type stubs now use ParamSpec from typing_extensions to support Python < 3.10.
RELEASE NOTES END

Reviewed-by: Nikola Forró
Reviewed-by: Maxwell G

Author: softwarefactory-project-zuul[bot]

.pre-commit-config.yaml

@@ -50,7 +50,10 @@ repos:
       - id: mypy
         args: [--show-error-codes, --ignore-missing-imports]
         additional_dependencies:
-          [types-setuptools, types-requests, types-python-dateutil]
+          - types-setuptools
+          - types-requests
+          - types-python-dateutil
+          - typing_extensions
           # This file is overridden by a type stub
         exclude: "specfile/context_management.py"
   - repo: https://github.com/teemtee/tmt.git

specfile/context_management.pyi

@@ -3,7 +3,9 @@
 
 import contextlib
 from collections.abc import Iterator
-from typing import Callable, Generator, ParamSpec, TypeVar
+from typing import Callable, Generator, TypeVar
+
+from typing_extensions import ParamSpec
 
 _T_co = TypeVar("_T_co", covariant=True)
 _P = ParamSpec("_P")