chore(deps): update dependency @lit-labs/observers to v2.0.4

Author: renovate[bot]

package-lock.json

@@ -45,7 +45,7 @@
   },
   "homepage": "https://github.com/stryker-mutator/mutation-testing-elements/tree/master/packages/elements#readme",
   "devDependencies": {
-    "@lit-labs/observers": "2.0.3",
+    "@lit-labs/observers": "2.0.4",
     "@playwright/test": "1.47.2",
     "@tailwindcss/forms": "0.5.9",
     "@types/express": "5.0.0",