Cleanup: Update copyright to the new format

Had put my name here since the choice was between the foundation
and me personally, with the blender authors file now being in
place this can be cleaned up.

build_files/build_environment/cmake/deps_html.cmake

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2023 Ray Molenkamp
+# SPDX-FileCopyrightText: 2023 Blender Authors
 #
 # SPDX-License-Identifier: GPL-2.0-or-later
 #

source/blender/io/usd/intern/usd_precomp.h

@@ -1,4 +1,4 @@
-/* SPDX-FileCopyrightText: 2023 Ray Molenkamp
+/* SPDX-FileCopyrightText: 2023 Blender Authors
  *
  * SPDX-License-Identifier: GPL-2.0-or-later */