chore: bump cssnano-preset-advanced from 7.0.16 to 8.0.0 (#241)

Bumps [cssnano-preset-advanced](https://github.com/cssnano/cssnano) from 7.0.16 to 8.0.0.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano-preset-advanced@7.0.16...cssnano-preset-advanced@8.0.0)

---
updated-dependencies:
- dependency-name: cssnano-preset-advanced
  dependency-version: 8.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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package.json

@@ -4,8 +4,8 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "devDependencies": {
-    "cssnano": "^7.0.2",
-    "cssnano-preset-advanced": "^7.0.2",
+    "cssnano": "^8.0.0",
+    "cssnano-preset-advanced": "^8.0.0",
     "gulp": "^5.0.0",
     "gulp-concat": "^2.6.1",
     "gulp-gzip": "^1.4.2",