chore(deps): Remove packaging dependency

[TheRealKeto]

This PR removes the redundant packaging dependency that ktool (currently) has. It's evident that such package is not needed; see the example below.

(venv) ~/Projects/ktool keto% python
Python 3.9.9 (main, Jan 21 2022, 10:41:38)
[Clang 13.0.0 (clang-1300.0.29.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import json
>>> import urllib.request
>>>
>>> ktool_ver_test = "0.20.0"
>>> endpoint = "https://pypi.org/pypi/k2l/json"
>>>
>>> with urllib.request.urlopen(endpoint, timeout=1) as url:
...     data = json.loads(url.read().decode(), strict=False)
...
>>> ktool_new_ver = data.get("info").get("version")
>>> if ktool_ver_test < ktool_new_ver:
...     print("A new version is available!")
...     print("Wow, imagine using an entire library for this")
...
A new version is available!
Wow, imagine using an entire library for this
>>> print(ktool_ver_test)
0.20.0
>>> print(ktool_new_ver)
0.20.1
>>>