ENH: Update OpenXRRemoting from 2.9.1 to 2.9.3

This enhancement enables building the SlicerVirtualReality extension against
the latest version (2.9.3) of Microsoft.Holographic.Remoting.OpenXr. This aligns
SlicerVirtualReality with the corresponding version of the "Holographic Remoting
Player" available on the Microsoft Store.

The update relies on VTK changes integrated into the upstream VTK project via
vtk/vtk!10814. Additionally, Slicer/VTK fork branches, namely Slicer/VTK#53
for SlicerPreview and Slicer/VTK#54 for SlicerStable, have been synchronized with
these changes.

For SlicerPreview, changes have been integrated in Slicer through Slicer/Slicer#7534.
In the case of SlicerStable, the updated VTK fork has been manually checked out
on the relevant build machines to incorporate the necessary adjustments.

SuperBuild/External_OpenXRRemoting.cmake

@@ -23,8 +23,8 @@ if((NOT OpenXRRemoting_BIN_DIR OR NOT OpenXRRemoting_INCLUDE_DIR)
 
   set(EP_INSTALL_DIR ${CMAKE_BINARY_DIR}/${proj}-install)
 
-  set(_ver "2.9.1")
-  set(_sha256 "e8174adaf64089a0cd7cc7e21445dbe8151b57b364312eab773e5c64d9dc28b1")
+  set(_ver "2.9.3")
+  set(_sha256 "9ef533aeff9ddef40104ad0d03e1e631c314729b18690385a4a624fab2408797")
 
   ExternalProject_Add(${proj}
     ${${proj}_EP_ARGS}