gh-65 address additional warnings reported by sonarqube

Signed-off-by: Victor Chang <[email protected]>

Author: mocsharp

src/DicomWebClient/DicomWebClient.cs

@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: © 2021-2022 MONAI Consortium
-// SPDX-FileCopyrightText: © 2019-2020 NVIDIA Corporation
+// SPDX-FileCopyrightText: � 2021-2022 MONAI Consortium
+// SPDX-FileCopyrightText: � 2019-2020 NVIDIA Corporation
 // SPDX-License-Identifier: Apache License 2.0
 
 using System;

src/InformaticsGateway/Common/Unsubscriber.cs

@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: © 2022 MONAI Consortium
-// SPDX-FileCopyrightText: © 2019-2021 NVIDIA Corporation
+// SPDX-FileCopyrightText: � 2022 MONAI Consortium
+// SPDX-FileCopyrightText: � 2019-2021 NVIDIA Corporation
 // SPDX-License-Identifier: Apache License 2.0
 
 using System;