CI: fix OSX setup in tutorials

[mloubout]

No description provided.

[codecov]

Codecov Report

Merging #1807 (0e53263) into master (5848cf3) will decrease coverage by 2.89%.
The diff coverage is 79.59%.

❗ Current head 0e53263 differs from pull request most recent head 877c311. Consider uploading reports for the commit 877c311 to get more accurate results

@@            Coverage Diff             @@
##           master    #1807      +/-   ##
==========================================
- Coverage   89.60%   86.70%   -2.90%     
==========================================
  Files         209      204       -5     
  Lines       34138    33625     -513     
  Branches     4449     5142     +693     
==========================================
- Hits        30588    29156    -1432     
- Misses       3065     3973     +908     
- Partials      485      496      +11     

Impacted Files	Coverage Δ
devito/core/gpu.py	91.32% <ø> (-5.11%)	⬇️
tests/test_gpu_openacc.py	5.80% <0.00%> (-92.26%)	⬇️
devito/arch/compiler.py	50.78% <50.00%> (-6.22%)	⬇️
devito/arch/archinfo.py	49.29% <88.23%> (+1.80%)	⬆️
tests/conftest.py	90.60% <100.00%> (-1.97%)	⬇️
tests/test_gpu_openmp.py	98.42% <100.00%> (+0.12%)	⬆️
tests/test_adjoint.py	26.66% <0.00%> (-73.34%)	⬇️
devito/ir/iet/efunc.py	40.62% <0.00%> (-50.00%)	⬇️
examples/seismic/tti/operators.py	53.94% <0.00%> (-43.16%)	⬇️
... and 57 more

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