Bump @wordpress/env from 4.3.1 to 5.3.0 (#29)

Bumps [@wordpress/env](https://github.com/WordPress/gutenberg/tree/HEAD/packages/env) from 4.3.1 to 5.3.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/env/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/[email protected]/packages/env)

---
updated-dependencies:
- dependency-name: "@wordpress/env"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>