set node version to 18

[koddsson]

What I did

1. I set engines.node version to at least 18.

I figured since we aren't even testing on node16 that we don't actually support it.

[changeset-bot]

🦋 Changeset detected

Latest commit: c185cba

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 31 packages

Name	Type
@web/rollup-plugin-import-meta-assets	Minor
@web/rollup-plugin-polyfills-loader	Minor
@web/test-runner-visual-regression	Minor
@web/test-runner-junit-reporter	Minor
@web/test-runner-browserstack	Minor
@web/test-runner-coverage-v8	Minor
@web/dev-server-import-maps	Minor
@web/test-runner-playwright	Minor
@web/test-runner-puppeteer	Minor
@web/test-runner-saucelabs	Minor
@web/test-runner-webdriver	Minor
@web/dev-server-storybook	Minor
@web/test-runner-commands	Minor
@web/test-runner-selenium	Minor
@web/dev-server-esbuild	Minor
@web/rollup-plugin-copy	Minor
@web/rollup-plugin-html	Minor
@web/test-runner-chrome	Minor
@web/dev-server-legacy	Minor
@web/dev-server-rollup	Minor
@web/test-runner-mocha	Minor
@web/polyfills-loader	Minor
@web/test-runner-core	Minor
@web/dev-server-core	Minor
@web/test-runner-cli	Minor
@web/dev-server-hmr	Minor
@web/config-loader	Minor
@web/browser-logs	Minor
@web/parse5-utils	Minor
@web/test-runner	Minor
@web/dev-server	Minor

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[koddsson]

Would this be all breaking changes? 🤔

[bashmish]

Would this be all breaking changes? 🤔

Theoretically. But for pragmatic reasons I'd keep it a patch

[bashmish]

Makes sense to me indeed!

[koddsson]

Makes sense to me indeed!

Nice! I'll update the versions to be a minor bump and if no one else chimes in soon I'll release this 👍🏻