Upgrade eslint-plugin-unicorn to version 60.0.0

This is a major version bump, but the changelog at
https://github.com/sindresorhus/eslint-plugin-unicorn/releases/tag/v60.0.0
doesn't indicate any breaking changes that should impact us.

Note that this brings the vulnerability count back to zero because this
version addresses GHSA-xffm-g5w8-qvg7.

Author: timvandermeij

package-lock.json

@@ -24,7 +24,7 @@
     "eslint-plugin-no-unsanitized": "^4.1.2",
     "eslint-plugin-perfectionist": "^4.15.0",
     "eslint-plugin-prettier": "^5.5.3",
-    "eslint-plugin-unicorn": "^59.0.1",
+    "eslint-plugin-unicorn": "^60.0.0",
     "globals": "^16.3.0",
     "gulp": "^5.0.1",
     "gulp-cli": "^3.1.0",