FIX: Bump pybids version

[levje]

Quick description

PyBids is used for scil_bids_validate. Current dcm2bids writes the "bids:" in the URI of the "IntendedFor" field of the JSON file associated with a fmap. The currently used pybids=0.18.1 doesn't seem to support this feature as an error unknown protocol: bids raises when using the scil_bids_validate script with data converted using the most recent dcm2bids version.

Bumping the pybids version solves this issue since the fix was merged in pybids==0.21.0.

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Checklist

• My code follows the style guidelines of this project (run autopep8)
• I added relevant citations to scripts, modules and functions docstrings and descriptions
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I moved all functions from the script file (except the argparser and main) to scilpy modules
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.61%. Comparing base (d19c255) to head (3501354).
⚠️ Report is 5 commits behind head on master.

❌ Your project status has failed because the head coverage (72.61%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1325      +/-   ##
==========================================
- Coverage   72.61%   72.61%   -0.01%     
==========================================
  Files         297      297              
  Lines       25850    25850              
  Branches     3638     3638              
==========================================
- Hits        18772    18771       -1     
+ Misses       5549     5548       -1     
- Partials     1529     1531       +2     

Flag	Coverage Δ
smoketests	69.79% <ø> (-0.01%)	⬇️
unittests	14.08% <ø> (ø)

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Components	Coverage Δ
Scripts	75.08% <ø> (-0.01%)	⬇️
Library	69.65% <ø> (ø)

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