Release minor version of Reffy - v18.1.0

New feature:
- Extract CDDL definitions (#1723)

If you parse `index.json`, note that, as opposed to other extracts, there may
be more than one CDDL extract per spec. As such, the value of the `cddl`
property is an array of strings, and not simply a string.

Dependencies bumped:
- Bump respec from 35.2.0 to 35.2.1 (#1729)
- Bump web-specs from 3.29.0 to 3.30.0 (#1730)
- Bump puppeteer from 23.10.1 to 23.10.4 (#1727, #1728)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "reffy",
-  "version": "18.0.1",
+  "version": "18.1.0",
   "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",