Bump default OptiX search location to 7.5

cmake/FindOptiX.cmake

@@ -34,9 +34,9 @@ if(DEFINED ENV{OptiX_INSTALL_DIR})
 else()
   message(NOTICE "-- !!! Warning OptiX_INSTALL_DIR not set in environment. using default")
   if (MSVC)
-    set(OptiX_INSTALL_DIR "C:\\ProgramData\\NVIDIA Corporation\\OptiX SDK 7.3.0")
+    set(OptiX_INSTALL_DIR "C:\\ProgramData\\NVIDIA Corporation\\OptiX SDK 7.5.0")
   else()
-    set(OptiX_INSTALL_DIR "/usr/local/NVIDIA-OptiX-SDK-7.3.0-linux64-x86_64")
+    set(OptiX_INSTALL_DIR "/usr/local/NVIDIA-OptiX-SDK-7.5.0-linux64-x86_64")
   endif()
   #set(OptiX_INSTALL_DIR "${CMAKE_SOURCE_DIR}/../" CACHE PATH "Path to OptiX installed location.")
 endif()