build(deps): bump parse5 from 5.1.1 to 6.0.0

Bumps [parse5](https://github.com/inikulin/parse5) from 5.1.1 to 6.0.0.
- [Release notes](https://github.com/inikulin/parse5/releases)
- [Changelog](https://github.com/inikulin/parse5/blob/master/docs/version-history.md)
- [Commits](inikulin/parse5@v5.1.1...v6.0.0)

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

Author: dependabot-preview[bot]

packages/purgecss-from-html/package.json

@@ -24,7 +24,7 @@
     "url": "https://github.com/FullHuman/purgecss/issues"
   },
   "dependencies": {
-    "parse5": "^5.1.1",
+    "parse5": "^6.0.0",
     "parse5-htmlparser2-tree-adapter": "^5.1.1"
   },
   "devDependencies": {