Import upstream changes (ecd8737fa3a3084f135f125805ba9841245835bb)

Author: lit-robot

package.json

@@ -54,8 +54,8 @@
     "@typescript-eslint/parser": "^5.25.0",
     "@web/dev-server": "^0.1.31",
     "@web/dev-server-legacy": "^1.0.0",
-    "@web/test-runner": "^0.13.27",
-    "@web/test-runner-playwright": "^0.8.8",
+    "@web/test-runner": "^0.15.0",
+    "@web/test-runner-playwright": "^0.9.0",
     "@webcomponents/webcomponentsjs": "^2.6.0",
     "eslint": "^8.15.0",
     "lit-analyzer": "^1.2.1",