Update test dependencies

Author: dgreif

package.json

@@ -37,12 +37,12 @@
   "devDependencies": {
     "@github/prettier-config": "^0.0.4",
     "@lhci/cli": "^0.10.0",
-    "@open-wc/testing": "^3.1.6",
+    "@open-wc/testing": "^4.0.0",
     "@size-limit/preset-small-lib": "^8.0.1",
     "@typescript-eslint/eslint-plugin": "^5.36.1",
     "@typescript-eslint/parser": "^5.36.1",
     "@web/dev-server-esbuild": "^0.3.2",
-    "@web/test-runner": "^0.14.0",
+    "@web/test-runner": "^0.20.0",
     "eslint": "^8.23.0",
     "eslint-plugin-github": "^4.3.7",
     "sinon": "^14.0.0",