Release patch version of Reffy - v18.3.1

Bug fixed:
- Fix unknown variable (#1765)

Dependencies bumped:
- Bump rollup from 4.31.0 to 4.34.2 (#1766)
- Bump puppeteer from 24.1.0 to 24.1.1 (#1759)
- Bump semver from 7.6.3 to 7.7.1 (#1767)
- Bump mocha from 11.0.1 to 11.1.0 (#1757)
- Bump undici from 7.2.3 to 7.3.0 (#1756)
- Bump web-specs from 3.35.0 to 3.37.0 (#1763)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "reffy",
-  "version": "18.3.0",
+  "version": "18.3.1",
   "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",