Update dependency @webcomponents/webcomponentsjs to ^2.8.0

Author: renovate[bot]

package-lock.json

@@ -49,7 +49,7 @@
     "@iiif/presentation-3": "^2.1.3",
     "@open-wc/testing-helpers": "3.0.1",
     "@types/jest": "29.5.14",
-    "@webcomponents/webcomponentsjs": "^2.6.0",
+    "@webcomponents/webcomponentsjs": "^2.8.0",
     "babel-loader": "9.2.1",
     "concurrently": "9.0.1",
     "core-js": "3.38.1",