Release patch version of Reffy - v18.6.1

Dependencies bumped:
- Bump rollup from 4.40.0 to 4.40.1 (#1822)
- Bump respec from 35.3.0 to 35.3.1 (#1820)
- Bump puppeteer from 24.6.1 to 24.7.2 (#1819)
- Bump web-specs from 3.46.0 to 3.49.0 (#1823)

Author: tidoust

package.json

@@ -1,6 +1,6 @@
 {
   "name": "reffy",
-  "version": "18.6.0",
+  "version": "18.6.1",
   "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",