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-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.13%. Comparing base (a3c05f9) to head (8ecaac2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1026   +/-   ##
=======================================
  Coverage   47.13%   47.13%           
=======================================
  Files          66       66           
  Lines        9836     9836           
  Branches     1084     1084           
=======================================
  Hits         4636     4636           
  Misses       4979     4979           
  Partials      221      221           

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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.

[tsalo]

I think we can merge this, but I'll need to run pixi lock in a followup PR afterward.