Relax depdencny requirements

[ppinchuk]

Since rex is meant to frequently be used in downstream libraries, we should relax the upper bound on dependencies to make it more compatible. The tradeoff is that it puts more onus on downstream users to test functionality, but good faith actors should be writing tests anyways so this is overall more flexible for end users.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.73%. Comparing base (57cbea2) to head (9bddc1f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #214   +/-   ##
=======================================
  Coverage   67.73%   67.73%           
=======================================
  Files          40       40           
  Lines        7095     7095           
  Branches     1039     1039           
=======================================
  Hits         4806     4806           
  Misses       1961     1961           
  Partials      328      328           

Flag	Coverage Δ
unittests	67.73% <ø> (ø)

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