changeset to publish firestore (#5010)

Author: Feiyang1

.changeset/gentle-items-refuse.md

@@ -0,0 +1,6 @@
+---
+'@firebase/firestore': patch
+---
+
+Fixes a regression that prevented Firestore from detecting Auth during its initial initialization, which could cause some writes to not be send.
+[4971](https://github.com/firebase/firebase-js-sdk/pull/4971) didn't actually fix it.