Bump to `brainglobe-atlasapi` dependency
`bg-atlasapi` has been renamed to `brainglobe-atlasapi`, so we now depend on the new package.
What's Changed
* Update CITATION.cff by willGraham01 in https://github.com/brainglobe/brainreg/pull/177
* bg-atlasapi -> brainglobe-atlasapi by willGraham01 in https://github.com/brainglobe/brainreg/pull/182
**Full Changelog**: https://github.com/brainglobe/brainreg/compare/v1.0.5...v1.0.6