Pin pybids version to fix upath protocol compatibility issue

[arovai]

Fixes #1025

The error 'Protocol not known: bids' occurred due to version incompatibility between pybids and upath. This commit pins pybids to version >= 0.15.0, < 0.16.0 to ensure a compatible version is installed that works properly with the rest of the dependencies.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1026   +/-   ##
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  Coverage          ?   46.28%           
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  Files             ?       65           
  Lines             ?     9814           
  Branches          ?     1088           
=========================================
  Hits              ?     4542           
  Misses            ?     5036           
  Partials          ?      236           

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[tsalo]

I'm hoping to overhaul the management of Python dependencies in #1028 soon so I may re-implement this once that is merged.