Remove duplicate test

[AlexWaygood]

This method is identical to test_hash_eq on lines 2296-2304:

typing_extensions/src/test_typing_extensions.py

Lines 2296 to 2304 in a0858e6

	def test_hash_eq(self):
	self.assertEqual(len({Annotated[int, 4, 5], Annotated[int, 4, 5]}), 1)
	self.assertNotEqual(Annotated[int, 4, 5], Annotated[int, 5, 4])
	self.assertNotEqual(Annotated[int, 4, 5], Annotated[str, 4, 5])
	self.assertNotEqual(Annotated[int, 4], Annotated[int, 4, 4])
	self.assertEqual(
	{Annotated[int, 4, 5], Annotated[int, 4, 5], Annotated[T, 4, 5]},
	{Annotated[int, 4, 5], Annotated[T, 4, 5]}
	)

(This is a backport of the only relevant part of python/cpython#102445)