Update python conformance failure list.

conformance/failure_list_python.txt

@@ -15,6 +15,3 @@ Required.ProtobufInput.IllegalZeroFieldNum_Case_0
 Required.ProtobufInput.IllegalZeroFieldNum_Case_1
 Required.ProtobufInput.IllegalZeroFieldNum_Case_2
 Required.ProtobufInput.IllegalZeroFieldNum_Case_3
-Required.ProtobufInput.RepeatedScalarSelectsLast.INT32.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.INT32.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.INT32.ProtobufOutput