REL: Add requests to requirements

[scottclowe]

We did not encounter the fact this was missing before because checkpoints had been cached when building with frozen requirements.

[codecov]

Codecov Report

Base: 28.43% // Head: 28.07% // Decreases project coverage by -0.35% ⚠️

Coverage data is based on head (1456964) compared to base (b4a0b40).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #320      +/-   ##
==========================================
- Coverage   28.43%   28.07%   -0.36%     
==========================================
  Files          45       45              
  Lines        5346     5346              
  Branches     1309     1309              
==========================================
- Hits         1520     1501      -19     
- Misses       3573     3593      +20     
+ Partials      253      252       -1     

Flag	Coverage Δ
unittests	28.07% <ø> (-0.32%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
echofilter/ui/checkpoints.py	34.73% <0.00%> (-8.99%)	⬇️
echofilter/path.py	60.78% <0.00%> (-3.93%)	⬇️
echofilter/ui/inference_cli.py	84.47% <0.00%> (-1.25%)	⬇️

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