Update dependency firebase to v8.4.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase (source, changelog)	8.4.1 -> 8.4.3

---

Release Notes

firebase/firebase-js-sdk

### [`v8.4.3`](https://togithub.com/firebase/firebase-js-sdk/compare/firebase@8.4.2...firebase@8.4.3) [Compare Source](https://togithub.com/firebase/firebase-js-sdk/compare/firebase@8.4.2...firebase@8.4.3) ### [`v8.4.2`](https://togithub.com/firebase/firebase-js-sdk/compare/firebase@8.4.1...firebase@8.4.2) [Compare Source](https://togithub.com/firebase/firebase-js-sdk/compare/firebase@8.4.1...firebase@8.4.2)

---

Configuration

:date: Schedule: At any time (no schedule defined).

:vertical_traffic_light: Automerge: Enabled.

:recycle: Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box.

---

This PR has been generated by WhiteSource Renovate. View repository job log here.