[python] Move dlib to the bottom of the stack

2 jobs for python38 in 39 minutes and 39 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #206890
docker
build_linux

00:39:39

failed #206891
macosx
build_macosx

00:01:48

 
Name Stage Failure
failed
build_linux Build
    return callback(*args, **kwargs)
File "/scratch/builds/bob/bob.conda/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/bdt.py", line 43, in _decorator
value = view_func(*args, **kwargs)
File "/scratch/builds/bob/bob.conda/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/ci.py", line 411, in base_build
condarc_options=condarc_options,
File "/scratch/builds/bob/bob.conda/miniconda/lib/python3.7/site-packages/bob/devtools/build.py", line 617, in base_build
% (recipe_dir, ", ".join(urls)),
TypeError: sequence item 2: expected str instance, NoneType found
ERROR: Job failed: exit code 1
failed
build_macosx Build
    return callback(*args, **kwargs)
File "/Users/gitlab/builds/b6d3167a/0/bob/bob.conda/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/bdt.py", line 43, in _decorator
value = view_func(*args, **kwargs)
File "/Users/gitlab/builds/b6d3167a/0/bob/bob.conda/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/ci.py", line 411, in base_build
condarc_options=condarc_options,
File "/Users/gitlab/builds/b6d3167a/0/bob/bob.conda/miniconda/lib/python3.7/site-packages/bob/devtools/build.py", line 617, in base_build
% (recipe_dir, ", ".join(urls)),
TypeError: sequence item 2: expected str instance, NoneType found
ERROR: Job failed: exit status 1