Merged with master

Author: hiranya911

FirebaseAdmin/FirebaseAdmin/Auth/FirebaseUserManager.cs

@@ -274,6 +274,7 @@ private async Task<DeserializedResponseInfo<TResult>> PostAndDeserializeAsync<TR
                 RequestUri = new Uri($"{this.baseUrl}/{path}"),
                 Content = NewtonsoftJsonSerializer.Instance.CreateJsonHttpContent(body),
             };
+            request.Headers.Add(ClientVersionHeader, ClientVersion);
             return await this.httpClient
                 .SendAndDeserializeAsync<TResult>(request, cancellationToken)
                 .ConfigureAwait(false);