Bump slugify from 1.5.0 to 1.5.3 (#6125)

Bumps [slugify](https://github.com/simov/slugify) from 1.5.0 to 1.5.3.
- [Release notes](https://github.com/simov/slugify/releases)
- [Commits](https://github.com/simov/slugify/compare/v1.5.0...v1.5.3)

---
updated-dependencies:
- dependency-name: slugify
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

docs/package.json

@@ -35,7 +35,7 @@
 		"lodash.get": "^4.4.2",
 		"micromark": "^2.10.1",
 		"npm-watch": "^0.9.0",
-		"slugify": "^1.4.6",
+		"slugify": "^1.5.3",
 		"vuepress": "^1.7.1",
 		"vuepress-plugin-clean-urls": "^1.1.2"
 	}