Update package.json to allow firebase-admin 13.x in peer-deps

Co-authored-by: Dennis Kugelmann <[email protected]>

package.json

@@ -57,7 +57,7 @@
     "typescript": "^4.2.5"
   },
   "peerDependencies": {
-    "firebase-admin": "^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0 || ^12.0.0",
+    "firebase-admin": "^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0 || ^12.0.0 || ^13.0.0",
     "firebase-functions": ">=4.9.0",
     "jest": ">=28.0.0"
   },