Bump to `brainglobe-atlasapi` dependency
`bg-atlasapi` has been renamed to `brainglobe-atlasapi`, so we now depend on the new package.
What's Changed
* bg-atlasapi -> brainglobe-atlasapi by willGraham01 in https://github.com/brainglobe/brainglobe-segmentation/pull/169
**Full Changelog**: https://github.com/brainglobe/brainglobe-segmentation/compare/v1.2.2...v1.2.3