Bump @wordpress/e2e-test-utils from 5.4.7 to 5.4.8

Bumps [@wordpress/e2e-test-utils](https://github.com/WordPress/gutenberg/tree/HEAD/packages/e2e-test-utils) from 5.4.7 to 5.4.8.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/e2e-test-utils/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/e2e-test-utils@5.4.8/packages/e2e-test-utils)

---
updated-dependencies:
- dependency-name: "@wordpress/e2e-test-utils"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -34,7 +34,7 @@
     "defaults"
   ],
   "devDependencies": {
-    "@wordpress/e2e-test-utils": "^5.4.7",
+    "@wordpress/e2e-test-utils": "^5.4.8",
     "@wordpress/eslint-plugin": "^9.1.2",
     "@wordpress/scripts": "^19.1.0",
     "prettier": "^2.4.1"