Release patch version of Reffy - v19.1.6

Feature patched:
- [CSS consolidation] Add `extended` to store list of extension URLs (#1904)

Dependencies bumped:
- Bump rollup from 4.45.1 to 4.46.1 (#1906)
- Bump web-specs from 3.58.0 to 3.59.0 (#1907)

Author: tidoust

package.json

@@ -1,6 +1,6 @@
 {
   "name": "reffy",
-  "version": "19.1.5",
+  "version": "19.1.6",
   "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",