refactor: Rename variable json to body to avoid using built-in package name

[chyroc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.51%. Comparing base (2c6d8eb) to head (cda5d9b).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
cozepy/request.py	80.00%	2 Missing ⚠️

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   76.51%   76.51%           
=======================================
  Files          30       30           
  Lines        1009     1009           
=======================================
  Hits          772      772           
  Misses        237      237           

Flag	Coverage Δ
	76.51% <80.00%> (ø)

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Files with missing lines	Coverage Δ
cozepy/request.py	78.87% <80.00%> (ø)