type is_dtype_equal

[MarcoGorelli]

• Closes #xxxx (Replace xxxx with the Github issue number)
• Tests added: Please use assert_type() to assert the type of any return value

There's already a test for this one using assert_type;

pandas-stubs/tests/test_api_types.py

Lines 125 to 126 in feebd47

	def test_is_dtype_equal() -> None:
	check(assert_type(api.is_dtype_equal("i4", np.int8), bool), bool)

the function just wasn't typed