Upgrade packages for unit testing and test with node 18 now too

[6utt3rfly]

I noticed some issues with trying to test locally, and then noticed that the unit tests were not actually running anymore and was just aborting. Even in the recent GH Actions, the log just carried on without running tests (see example)

Updates:

• pnpm 6.0.2 => 7.x
• http-server 0.12.3 => 14.1.1
• puppeteer 5.5.2 => 19.9.0

PR is from a fork to prove the GH Actions. See the fork's log

fixes #246

[github-actions[bot]]

:tada: This PR is included in version 1.3.9 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: