Use try/except for ParamSpec

setup.cfg

@@ -38,7 +38,7 @@ install_requires =
  # we're using typing_extensions even for new versions of python, so we don't pollute our code
  # with try/except every time we use new feature.
  # typing_extensions will use version from typing module if it detects new enough python.
- typing-extensions>=4.2;python_version>='3.6'
+ typing-extensions>=4.2;python_version>='3.6',<'3.10'
  # note: do not use double quotes in these, this triggers a weird bug in PyCharm in debug mode only
  funcsigs;python_version<'3.3'
  enum34;python_version<'3.4'

src/decopatch/main.pyi

@@ -1,6 +1,11 @@
 from typing import Any, Callable, Optional, Protocol, TypeVar, overload
 
-from typing_extensions import ParamSpec
+try:
+ # We're importing typing_extensions version first, becouse it will
+ # detect best available implementation depending on python version.
+ from typing_extensions import ParamSpec
+except ImportError:
+ from typing import ParamSpec
 
 from decopatch.utils_disambiguation import FirstArgDisambiguation
 from decopatch.utils_modes import SignatureInfo