feat: remove dependency to urllib3 from kube_config, pin urlllib>=1.23 due to CVE-2018-20060

[tomplus]

This library doesn't need to use the urllib3 - it uses the iohttp instead. In this PR I remove a dependency to urllib3 from kube_config.py. The library is still required by the generated part by swagger-codegen.

I also change the required version >=1.23 due to security patches.

[codecov-io]

Codecov Report

Merging #56 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #56   +/-   ##
=======================================
  Coverage   94.38%   94.38%           
=======================================
  Files          20       20           
  Lines        1354     1354           
=======================================
  Hits         1278     1278           
  Misses         76       76

Impacted Files	Coverage Δ
kubernetes_asyncio/config/kube_config.py	92.33% <100%> (ø)	⬆️

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[TrueBrain]

Any chance for a new release soon? The GitHub banner is pretty invasive (for good reasons I guess), and it would be nice to get ride of it :)

Tnx a lot, also for this library :)

[tomplus]

@TrueBrain Sure, I've just released the version v8.0.2. Thank you.