chore(deps): update dependency @open-wc/testing to v4

Author: renovate[bot]

html-test/package-lock.json

@@ -18,7 +18,7 @@
     "lit-html": "1.4.1"
   },
   "devDependencies": {
-    "@open-wc/testing": "2.5.33",
+    "@open-wc/testing": "4.0.0",
     "@web/test-runner": "0.16.0",
     "@web/dev-server": "0.4.6"
   }

html-test/package.json

@@ -16,7 +16,7 @@
     "lit-html": "1.4.1"
   },
   "devDependencies": {
-    "@open-wc/testing": "2.5.33",
+    "@open-wc/testing": "4.0.0",
     "@web/dev-server-import-maps": "0.2.1",
     "@web/test-runner": "0.16.0"
   }

import-maps/package-lock.json

@@ -18,7 +18,7 @@
     "lit-html": "1.4.1"
   },
   "devDependencies": {
-    "@open-wc/testing": "2.5.33",
+    "@open-wc/testing": "4.0.0",
     "@rollup/plugin-json": "6.1.0",
     "@web/dev-server": "0.4.6",
     "@web/dev-server-rollup": "0.6.4",

import-maps/package.json

@@ -20,7 +20,7 @@
     "lit-html": "1.4.1"
   },
   "devDependencies": {
-    "@open-wc/testing": "2.5.33",
+    "@open-wc/testing": "4.0.0",
     "@types/node": "14.18.63",
     "@web/dev-server": "0.4.6",
     "@web/dev-server-esbuild": "0.4.4",