fix ca1849

false positive

https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1849

Author: mus65

src/Renci.SshNet/SftpClient.cs

@@ -2486,6 +2486,7 @@ private async Task InternalDownloadFileAsync(string path, Stream output, Cancell
         }
 
 #pragma warning disable S6966 // Awaitable method should be used
+#pragma warning disable CA1849 // Call async methods when in an async method
         private async Task InternalUploadFile(
             Stream input,
             string path,
@@ -2625,6 +2626,7 @@ private async Task InternalUploadFile(
             }
         }
 #pragma warning restore S6966 // Awaitable method should be used
+#pragma warning restore CA1849 // Call async methods when in an async method
 
         /// <summary>
         /// Called when client is connected to the server.