Release patch version of Reffy - v18.6.2

Dependencies bumped:
- Bump web-specs from 3.49.0 to 3.50.0 (#1831)
- Bump undici from 7.8.0 to 7.9.0 (#1830)
- Bump rollup from 4.40.1 to 4.40.2 (#1827)
- Bump mocha from 11.1.0 to 11.2.2 (#1825)
- Bump puppeteer from 24.7.2 to 24.8.2 (#1829)

Author: tidoust

package.json

@@ -1,6 +1,6 @@
 {
   "name": "reffy",
-  "version": "18.6.1",
+  "version": "18.6.2",
   "description": "W3C/WHATWG spec dependencies exploration companion. Features a short set of tools to study spec references as well as WebIDL term definitions and references found in W3C specifications.",
   "repository": {
     "type": "git",