chore(deps-dev): bump cssnano from 6.1.2 to 7.1.3 in /client

Bumps [cssnano](https://github.com/cssnano/cssnano) from 6.1.2 to 7.1.3.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@6.1.2...cssnano@7.1.3)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-version: 7.1.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

client/package.json

@@ -154,7 +154,7 @@
     "ckeditor5": "^47.6.2",
     "compression-webpack-plugin": "^12.0.0",
     "css-loader": "^7.1.4",
-    "cssnano": "^6.1.2",
+    "cssnano": "^7.1.3",
     "dotenv-webpack": "^8.1.1",
     "enzyme": "^3.11.0",
     "enzyme-to-json": "^3.6.2",