New line actor, thanks to paulbrodersen!
See the [example](https://github.com/brainglobe/brainrender/blob/main/examples/line.py) for details.
What's Changed
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/brainglobe/brainrender/pull/333
* Add line actor by paulbrodersen in https://github.com/brainglobe/brainrender/pull/334
**Full Changelog**: https://github.com/brainglobe/brainrender/compare/v2.1.6...v2.1.7