build: bump @webcomponents/custom-elements from 1.2.1 to 1.4.2 (#20789)
build: bump @webcomponents/custom-elements from 1.2.1 to 1.4.2 (#20789)

Bumps [@webcomponents/custom-elements](https://github.com/webcomponents/polyfills/tree/HEAD/packages/custom-elements) from 1.2.1 to 1.4.2.
- [Release notes](https://github.com/webcomponents/polyfills/releases)
- [Changelog](https://github.com/webcomponents/polyfills/blob/master/packages/custom-elements/CHANGELOG.md)
- [Commits](https://github.com/webcomponents/polyfills/commits/@webcomponents/custom-elements@1.4.2/packages/custom-elements)

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
andrewseguin/material2,angular/components,DevVersion/material2,angular/components,DevVersion/material2,DevVersion/material2,crisbeto/material2,DevVersion/material2,andrewseguin/material2,andrewseguin/material2,josephperrott/material2,crisbeto/material2,mmalerba/material2,angular/components,josephperrott/material2,andrewseguin/material2,mmalerba/material2,angular/components,josephperrott/material2,DevVersion/material2,crisbeto/material2,crisbeto/material2,josephperrott/material2,andrewseguin/material2,mmalerba/material2,mmalerba/material2,mmalerba/material2,josephperrott/material2