Include missing cached-iterable dev dependency in package.json

This dependency got introduced during the move to Fluent for
localization (bug 1858715), but it wasn't added to `package.json`
at the time. This worked because other dependencies already
installed it, but we shouldn't rely on that, so this commit
explicitly includes it in `package.json` instead.

Fixes 66982a2a.

package-lock.json

@@ -19,6 +19,7 @@
         "@types/node": "^24.10.0",
         "autoprefixer": "^10.4.21",
         "babel-loader": "^10.0.0",
+        "cached-iterable": "^0.3.0",
         "caniuse-lite": "^1.0.30001754",
         "core-js": "^3.46.0",
         "eslint": "^9.39.1",
@@ -4100,7 +4101,6 @@
       "resolved": "https://registry.npmjs.org/cached-iterable/-/cached-iterable-0.3.0.tgz",
       "integrity": "sha512-MDqM6TpBVebZD4UDtmlFp8EjVtRcsB6xt9aRdWymjk0fWVUUGgmt/V7o0H0gkI2Tkvv8B0ucjidZm4mLosdlWw==",
       "dev": true,
-      "license": "Apache-2.0",
       "engines": {
         "node": ">=8.9.0"
       }

package.json

@@ -14,6 +14,7 @@
     "@types/node": "^24.10.0",
     "autoprefixer": "^10.4.21",
     "babel-loader": "^10.0.0",
+    "cached-iterable": "^0.3.0",
     "caniuse-lite": "^1.0.30001754",
     "core-js": "^3.46.0",
     "eslint": "^9.39.1",