Support jumps in Python 3.10+

[Svenskithesource]

In Python 3.10+ the arguments for all jump opcodes were divided by 2. We need to handle that in the unpacker.
See the example below:

Python 3.10.4 (tags/v3.10.4:9d38120, Mar 23 2022, 23:13:41) [MSC v.1929 64 bit (AMD64)] on win32
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>>> import dis
>>> def demo(num):
...     if num == 1:
...         print("equal")
...     else:
...         print("not equal")
...
>>> dis.dis(demo.__code__)
  2           0 LOAD_FAST                0 (num)
              2 LOAD_CONST               1 (1)
              4 COMPARE_OP               2 (==)
              6 POP_JUMP_IF_FALSE       10 (to 20)

  3           8 LOAD_GLOBAL              0 (print)
             10 LOAD_CONST               2 ('equal')
             12 CALL_FUNCTION            1
             14 POP_TOP
             16 LOAD_CONST               0 (None)
             18 RETURN_VALUE

  5     >>   20 LOAD_GLOBAL              0 (print)
             22 LOAD_CONST               3 ('not equal')
             24 CALL_FUNCTION            1
             26 POP_TOP
             28 LOAD_CONST               0 (None)
             30 RETURN_VALUE
>>>

We can see that the argument for instruction at index 6 (POP_JUMP_IF_FALSE) has argument 10. dis shows us it's actually pointing to index 20.