build(deps-dev): bump cssnano from 6.1.2 to 7.0.6

Bumps [cssnano](https://github.com/cssnano/cssnano) from 6.1.2 to 7.0.6.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/[email protected]@7.0.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -43,7 +43,7 @@
     "babel-plugin-rewire": "^1.2.0",
     "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
     "chai": "^5.1.1",
-    "cssnano": "^6.1.2",
+    "cssnano": "^7.0.6",
     "cypress": "13.14.2",
     "eslint": "^8.57.0",
     "eslint-plugin-jest": "^28.3.0",