Disallow httpx versions past 0.23.0, when python 3.6 was dropped

[alexgolec]

No description provided.

[codecov]

Codecov Report

Merging #325 (57271c2) into master (b25f3fc) will not change coverage.
The diff coverage is n/a.

❗ Current head 57271c2 differs from pull request most recent head 19a6df2. Consider uploading reports for the commit 19a6df2 to get more accurate results

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          19       19           
  Lines        2198     2198           
  Branches      307      217   -90     
=======================================
  Hits         2189     2189           
  Misses          4        4           
  Partials        5        5           

Flag	Coverage Δ
unittests	99.59% <ø> (ø)

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