[packaging] Bump version of requests in requirements.txt

[giordano]

This makes requests compatible with chardet v5: psf/requests#6179

[giordano]

But chardet 5 removed support for Python 3.6: https://github.com/chardet/chardet/releases/tag/5.0.0. Sigh. Can we maybe allow both 2.27.1 and 2.28.1?

[jenkins-cscs]

Can I test this patch?

[teojgo]

Ok to test

[codecov-commenter]

Codecov Report

Merging #2579 (7840245) into master (0463226) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2579   +/-   ##
=======================================
  Coverage   86.69%   86.70%           
=======================================
  Files          59       59           
  Lines       10827    10827           
=======================================
+ Hits         9387     9388    +1     
+ Misses       1440     1439    -1     

Impacted Files	Coverage Δ
reframe/frontend/executors/policies.py	92.59% <0.00%> (+0.28%)	⬆️

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[teojgo]

@jenkins-cscs retry daint