Fix tests

Author: AlexWaygood

test-data/unit/pythoneval.test

@@ -268,7 +268,9 @@ def bin(f: IO[bytes]) -> None:
 txt(sys.stdout)
 bin(sys.stdout)
 [out]
-_program.py:5: error: Argument 1 to "write" of "IO" has incompatible type "bytes"; expected "str"
+_program.py:5: error: No overload variant of "write" of "IO" matches argument type "bytes"
+_program.py:5: note: Possible overload variants:
+_program.py:5: note:     def write(self, str, /) -> int
 _program.py:10: error: Argument 1 to "bin" has incompatible type "TextIO"; expected "IO[bytes]"
 
 [case testBuiltinOpen]