Fix incorrect pin of requests

[maxbelanger]

The change in #492 aimed to restore Python 2.7 support in CI. This included an attempt to avoid automatically pulling in urllib3>=2 as that introduces potential breaking changes. The change both (incorrectly) introduced a maximum version requirement for requests and (correctly) added a requirement to pin urllib3<2 (as suggested in the docs for requests and urllib3). It should only have done the latter.

This reverts the version requirement for requests to what it was prior to #492. Fixes #504.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.28%. Comparing base (1d379b4) to head (758ad80).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #505      +/-   ##
==========================================
+ Coverage   64.26%   64.28%   +0.02%     
==========================================
  Files          31       31              
  Lines       53579    53579              
  Branches     3905     3905              
==========================================
+ Hits        34430    34444      +14     
+ Misses      18989    18972      -17     
- Partials      160      163       +3     

Flag	Coverage Δ
integration	64.19% <ø> (+0.02%)	⬆️
unit	63.70% <ø> (ø)

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