Update URL of Cookie Store API following move to WHATWG (#2057)

Via web-platform-tests/wpt#54005 (comment)

Author: tidoust

specs.json

@@ -64,6 +64,12 @@
   },
   "https://compression.spec.whatwg.org/",
   "https://console.spec.whatwg.org/",
+  {
+    "url": "https://cookiestore.spec.whatwg.org/",
+    "formerNames": [
+      "cookie-store"
+    ]
+  },
   {
     "url": "https://datatracker.ietf.org/doc/html/draft-cutler-httpbis-partitioned-cookies",
     "nightly": {
@@ -715,7 +721,6 @@
     ]
   },
   "https://wicg.github.io/content-index/spec/",
-  "https://wicg.github.io/cookie-store/",
   "https://wicg.github.io/crash-reporting/",
   {
     "url": "https://wicg.github.io/csp-next/scripting-policy.html",