chore(deps-dev): bump cssnano from 6.1.2 to 7.0.0 (#9874)

Bumps [cssnano](https://github.com/cssnano/cssnano) from 6.1.2 to 7.0.0.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@6.1.2...cssnano@7.0.0)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -134,7 +134,7 @@
     "cors": "^2.8.5",
     "cross-env": "=7.0.3",
     "css-loader": "=7.1.1",
-    "cssnano": "=6.1.2",
+    "cssnano": "=7.0.0",
     "cypress": "=13.8.1",
     "dedent": "^1.5.3",
     "deepmerge": "^4.3.1",