deps: bump unique-slug from 3.0.0 to 4.0.0

Bumps [unique-slug](https://github.com/npm/unique-slug) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/npm/unique-slug/releases)
- [Changelog](https://github.com/npm/unique-slug/blob/main/CHANGELOG.md)
- [Commits](npm/unique-slug@v3.0.0...v4.0.0)

---
updated-dependencies:
- dependency-name: unique-slug
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -29,7 +29,7 @@
     "tap": "^16.3.0"
   },
   "dependencies": {
-    "unique-slug": "^3.0.0"
+    "unique-slug": "^4.0.0"
   },
   "files": [
     "bin/",