Bump @webref/idl from 3.68.3 to 3.68.4 (#2859)

Author: dependabot[bot]

package-lock.json

@@ -99,7 +99,7 @@
     "@types/yargs": "^17.0.34",
     "@webref/css": "8.0.1",
     "@webref/elements": "^2.5.1",
-    "@webref/idl": "3.68.3",
+    "@webref/idl": "3.68.4",
     "c8": "10.1.3",
     "chai": "4.5.0",
     "chai-as-promised": "8.0.2",