fix: Upgraded Firestore and Storage dependencies (#428)

Author: hiranya911

go.mod

@@ -3,10 +3,9 @@ module firebase.google.com/go/v4
 go 1.11
 
 require (
-	cloud.google.com/go/firestore v1.1.1
-	cloud.google.com/go/storage v1.0.0
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	google.golang.org/api v0.17.0
-	google.golang.org/appengine v1.6.1
-	google.golang.org/grpc v1.29.1 // indirect
+	cloud.google.com/go/firestore v1.5.0
+	cloud.google.com/go/storage v1.10.0
+	golang.org/x/oauth2 v0.0.0-20210218202405-ba52d332ba99
+	google.golang.org/api v0.40.0
+	google.golang.org/appengine v1.6.7
 )