Revert "(BSR) chore(deps): Bump firebase from 9.6.11 to 10.9.0 (#7231)"

This reverts commit a292324.

yarn.lock

@@ -6733,7 +6733,6 @@ __metadata:
     node-fetch: 2.6.7
     selenium-webdriver: ^4.0.0-beta.2
     tslib: ^2.1.0
-    undici: 6.19.7
   peerDependencies:
     "@firebase/app-compat": 0.x
   checksum: bfe52fa097bfdaa9f427e5bd89ae4a6612f38f3da870d5b1c74ac81089ccb9c216192bd1d012a74a66c05adf1adeab1a00b7a8c524bcf3564a4423fe31b70d23
@@ -33240,13 +33239,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"undici@npm:6.19.7":
-  version: 6.19.7
-  resolution: "undici@npm:6.19.7"
-  checksum: ccf7f311cc2f7109e03c433190cb13d45c581905a70674992b0d8469c36ec1ae011824f41ba0c4a85b9771e4dd30a94228315c316215f76fafcb8e3b91ffbc22
-  languageName: node
-  linkType: hard
-
 "unfetch@npm:^4.2.0":
   version: 4.2.0
   resolution: "unfetch@npm:4.2.0"