[refactor] Remove dependency on typing_extensions.

Signed-off-by: Michael Seifert <m.seifert@digitalernachschub.de>

Author: seifertm

dependencies/default/constraints.txt

@@ -20,5 +20,4 @@ sortedcontainers==2.4.0
 tomli==2.0.1
 trio==0.22.2
 typed-ast==1.5.5
-typing-extensions==4.7.1
 zipp==3.17.0

dependencies/default/requirements.txt

@@ -1,4 +1,3 @@
 # Always adjust install_requires in setup.cfg and pytest-min-requirements.txt
 # when changing runtime dependencies
 pytest >= 7.0.0
-typing-extensions >= 4.0; python_version < "3.11"

dependencies/pytest-min/constraints.txt

@@ -19,5 +19,4 @@ requests==2.28.1
 sortedcontainers==2.4.0
 tomli==2.0.1
 urllib3==1.26.12
-typing-extensions==4.7.1
 xmlschema==2.1.1

dependencies/pytest-min/requirements.txt

@@ -1,4 +1,3 @@
 # Always adjust install_requires in setup.cfg and requirements.txt
 # when changing minimum version dependencies
 pytest[testing] == 7.0.0
-typing-extensions >= 4.0; python_version < "3.11"

pytest_asyncio/plugin.py

@@ -37,7 +37,6 @@
     Session,
     StashKey,
 )
-from typing_extensions import Self
 
 _R = TypeVar("_R")
 
@@ -366,7 +365,7 @@ def substitute(cls, item: pytest.Function, /) -> pytest.Function:
         return item
 
     @classmethod
-    def _from_function(cls, function: pytest.Function, /) -> Self:
+    def _from_function(cls, function: pytest.Function, /) -> pytest.Function:
         """
         Instantiates this specific PytestAsyncioFunction type from the specified
         pytest.Function item.

setup.cfg

@@ -41,7 +41,6 @@ include_package_data = True
 # Always adjust requirements.txt and pytest-min-requirements.txt when changing runtime dependencies
 install_requires =
   pytest >= 7.0.0
-  typing-extensions >= 4.0;python_version < "3.11"
 
 [options.extras_require]
 testing =