Update to brainreg v1 compliance

[willGraham01]

Updates cellfinder to be compliant with the upcoming release of brainreg version 1, as per brainglobe/brainreg#146.

Note that pyproject.toml now pins the brainreg version to be v1.0.0 to prevent users from installing an old version of brainreg through their cellfinder install.

Merge order

This needs to be merged after brainglobe/brainreg#146 and the new release of brainreg (version 1.0.0) is available on PyPI.

CI will fail until these conditions are met.

On merge

cellfinder will need a new release. This release version must be <v1.0.0.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (21f724b) 23.31% compared to head (e17bb01) 23.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #255   +/-   ##
=======================================
  Coverage   23.31%   23.31%           
=======================================
  Files          22       22           
  Lines        1214     1214           
=======================================
  Hits          283      283           
  Misses        931      931           

Files	Coverage Δ
cellfinder/main.py	0.00% <0.00%> (ø)
cellfinder/tools/prep.py	0.00% <0.00%> (ø)
cellfinder/tools/parser.py	0.00% <0.00%> (ø)

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