v1.6.0

chore(release): 1.6.0 [skip ci]

# [1.6.0](https://github.com/voxmedia/github-action-slack-notify-build/compare/v1.5.0...v1.6.0) (2023-01-03)

### Features

* upgrade to node 16 ([d3b556f](https://github.com/voxmedia/github-action-slack-notify-build/commit/d3b556fae7084b5835b1bef108379f0293ac64e9))