Bump @wordpress/env from 5.2.0 to 5.4.0 (#1504)

Bumps [@wordpress/env](https://github.com/WordPress/gutenberg/tree/HEAD/packages/env) from 5.2.0 to 5.4.0.
- [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/env@5.4.0/packages/env)

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

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package.json

@@ -11,7 +11,7 @@
     "url": "https://github.com/GlotPress/GlotPress/issues"
   },
   "devDependencies": {
-    "@wordpress/env": "^5.2.0",
+    "@wordpress/env": "^5.4.0",
     "@wordpress/scripts": "^24.3.0",
     "grunt": "^1.5.3",
     "grunt-contrib-cssmin": "^4.0.0",