Don't use long in Proto types (#2386)

Author: schmidt-sebastian

packages/firestore/src/protos/firestore_proto_api.d.ts

@@ -363,7 +363,7 @@ export declare namespace firestoreV1ApiClientInterfaces {
     booleanValue?: boolean;
     integerValue?: string;
     doubleValue?: number;
-    timestampValue?: string | { seconds: long; nanos: long };
+    timestampValue?: string | { seconds: string; nanos: number };
     stringValue?: string;
     bytesValue?: string | Uint8Array;
     referenceValue?: string;