reqs: pip new file arg format

[georgebisbas]

Fixing according to new pip reqs format
According to: https://stackoverflow.com/questions/68571543/using-a-pip-requirements-file-in-a-conda-yml-file-throws-attributeerror-fileno

[codecov]

Codecov Report

Merging #1733 (f0d27fa) into master (c2a49f5) will decrease coverage by 1.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1733      +/-   ##
==========================================
- Coverage   89.44%   88.06%   -1.39%     
==========================================
  Files         203      208       +5     
  Lines       33036    33583     +547     
  Branches     4328     4361      +33     
==========================================
+ Hits        29549    29574      +25     
- Misses       2984     3501     +517     
- Partials      503      508       +5     

Impacted Files	Coverage Δ
tests/test_gpu_openmp.py	4.51% <0.00%> (-93.79%)	⬇️
tests/test_adjoint.py	26.66% <0.00%> (-73.34%)	⬇️
examples/seismic/tti/wavesolver.py	66.11% <0.00%> (-32.24%)	⬇️
examples/seismic/tti/operators.py	71.78% <0.00%> (-25.32%)	⬇️
devito/passes/iet/languages/utils.py	86.66% <0.00%> (-13.34%)	⬇️
examples/seismic/viscoacoustic/wavesolver.py	87.15% <0.00%> (-12.85%)	⬇️
examples/seismic/viscoacoustic/operators.py	88.18% <0.00%> (-11.82%)	⬇️
tests/test_derivatives.py	92.80% <0.00%> (-7.20%)	⬇️
devito/core/gpu.py	90.32% <0.00%> (-5.92%)	⬇️
tests/test_dse.py	94.51% <0.00%> (-5.29%)	⬇️
... and 30 more

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