feat: drop the legacy httpx_mock fixture

[browniebroke]

To enable running this plugin alongside pytest-httpx. Will use my fork for the time of the migration, so opening this in case others need it too.

Fix #51

[angryfoxx]

hi @browniebroke thats a good point but could you care the format/lint rules please. after that will release new version with this pr

[browniebroke]

could you care the format/lint rules please

Yes of course, will do 👍🏻 Thanks

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2a7515d) to head (1b6d176).
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Additional details and impacted files

@@            Coverage Diff            @@
##            master       #52   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          380       375    -5     
  Branches        72        71    -1     
=========================================
- Hits           380       375    -5     

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