Refacto: use requests to download files

[Guts]

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[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (84353dd) 64.40% compared to head (856fad2) 64.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #367      +/-   ##
==========================================
- Coverage   64.40%   64.32%   -0.09%     
==========================================
  Files          44       44              
  Lines        2551     2548       -3     
  Branches      542      542              
==========================================
- Hits         1643     1639       -4     
- Misses        755      756       +1     
  Partials      153      153              

Files	Coverage Δ
qgis_deployment_toolbelt/commands/upgrade.py	63.04% <100.00%> (+0.27%)	⬆️
qgis_deployment_toolbelt/utils/proxies.py	67.50% <100.00%> (-10.00%)	⬇️
qgis_deployment_toolbelt/utils/file_downloader.py	86.11% <86.66%> (+5.03%)	⬆️