build(deps-dev): bump @wordpress/plugins from 7.37.0 to 7.40.0

Bumps [@wordpress/plugins](https://github.com/WordPress/gutenberg/tree/HEAD/packages/plugins) from 7.37.0 to 7.40.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/plugins/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/plugins@7.40.0/packages/plugins)

---
updated-dependencies:
- dependency-name: "@wordpress/plugins"
  dependency-version: 7.40.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]