Drop Python 3.6

[mr-c]

No description provided.

[codecov]

Codecov Report

Merging #1593 (d047089) into main (73e5295) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1593      +/-   ##
==========================================
+ Coverage   65.95%   66.01%   +0.06%     
==========================================
  Files          93       93              
  Lines       16447    16469      +22     
  Branches     4358     4364       +6     
==========================================
+ Hits        10847    10872      +25     
+ Misses       4441     4439       -2     
+ Partials     1159     1158       -1     

Impacted Files	Coverage Δ
cwltool/job.py	76.37% <ø> (ø)
cwltool/context.py	97.27% <100.00%> (-0.02%)	⬇️
cwltool/cuda.py	35.29% <100.00%> (ø)
cwltool/provenance.py	81.26% <100.00%> (+0.36%)	⬆️
cwltool/utils.py	79.92% <100.00%> (+0.22%)	⬆️
cwltool/main.py	67.42% <0.00%> (-0.27%)	⬇️
context.py	93.19% <0.00%> (-0.05%)	⬇️
cuda.py	20.58% <0.00%> (ø)
utils.py	75.18% <0.00%> (+0.27%)	⬆️
job.py	62.52% <0.00%> (+0.98%)	⬆️
... and 1 more

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