fix CI after upstream changes

[sappelhoff]

PR Description

goes together with

• BUG: Add estimated fiducials when missing / assumed head coords mne-python#11212

to fix the CI

identified in

• [MRG] Suggest alternatives when value not found in list #1066 (comment)

Also fixes a bug with _orig_units, because the format has changed upstream in:

• BUG: Fix consistency bug with orig units mne-python#11160

ready for merge after the MNE-Python PR above has been merged.

Merge checklist

Maintainer, please confirm the following before merging.
If applicable:

• All comments are resolved
• This is not your own PR
• All CIs are happy
• PR title starts with [MRG]
• whats_new.rst is updated
• New contributors have been added to CITATION.cff
• PR description includes phrase "closes <#issue-number>"

[codecov]

Codecov Report

Merging #1071 (e8c0fc7) into main (6624276) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1071   +/-   ##
=======================================
  Coverage   95.21%   95.21%           
=======================================
  Files          24       24           
  Lines        3845     3845           
=======================================
  Hits         3661     3661           
  Misses        184      184           

Impacted Files	Coverage Δ
mne_bids/write.py	97.29% <100.00%> (ø)

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[hoechenberger]

Thanks @sappelhoff