Update dependency com.google.firebase:firebase-auth to v21.1.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -42,7 +42,7 @@ accompanist = "0.26.2-beta"
 firebasePlugin = "4.3.14"
 multiplatformFirebaseAuth = "1.6.2"
 firebaseCommon = "20.2.0"
-firebaseAuth = "21.0.8"
+firebaseAuth = "21.1.0"
 androidxStartup = "1.1.1"
 kluent = "1.69"
 coilCompose = "2.2.2"