Misc updates

[dlockhart]

Sorry, grouping a few things I noticed in here:

• upgrade to eslint 8
• moving the saucelabs runner dependency into the action
• adopting a .nvmrc file so we can control the Node version in a single place

[ghost]

:tada: This PR is included in version 1.11.0 :tada:

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot :package::rocket: