Use PEP 695 syntax

Author: AA-Turner

sphinx/search/__init__.py

@@ -27,12 +27,12 @@
 
     from sphinx.environment import BuildEnvironment
 
-    class _ReadableStream[T_co](Protocol):
-        def read(self, n: int = ..., /) -> T_co: ...
-        def readline(self, n: int = ..., /) -> T_co: ...
+    class _ReadableStream[T](Protocol):
+        def read(self, n: int = ..., /) -> T: ...
+        def readline(self, n: int = ..., /) -> T: ...
 
-    class _WritableStream[T_contra](Protocol):
-        def write(self, s: T_contra, /) -> object: ...
+    class _WritableStream[T](Protocol):
+        def write(self, s: T, /) -> object: ...
 
 
 _NON_MINIFIED_JS_PATH = package_dir.joinpath('search', 'non-minified-js')