chore(deps): bump slug and @types/slug (#3804)

Bumps [slug](https://github.com/Trott/slug) and [@types/slug](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/slug). These dependencies needed to be updated together.

Updates `slug` from 4.0.4 to 5.3.0
- [Release notes](https://github.com/Trott/slug/releases)
- [Changelog](https://github.com/Trott/slug/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Trott/slug/compare/v4.0.4...v5.3.0)

Updates `@types/slug` from 5.0.2 to 5.0.3
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/slug)

---
updated-dependencies:
- dependency-name: slug
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/slug"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

package.json

@@ -191,7 +191,7 @@
     "sequelize-typescript": "^2.1.3",
     "slate": "0.45.0",
     "slate-md-serializer": "5.5.4",
-    "slug": "^4.0.4",
+    "slug": "^5.3.0",
     "slugify": "^1.6.5",
     "smooth-scroll-into-view-if-needed": "^1.1.32",
     "socket.io": "^3.1.2",
@@ -279,7 +279,7 @@
     "@types/refractor": "^3.0.2",
     "@types/semver": "^7.3.9",
     "@types/sequelize": "^4.28.10",
-    "@types/slug": "^5.0.2",
+    "@types/slug": "^5.0.3",
     "@types/stoppable": "^1.1.1",
     "@types/styled-components": "^5.1.15",
     "@types/throng": "^5.0.3",