COMP: Fix Linux build with Autoscoper CUDA backend enabled

Ensure CUDACXX env. var is properly set and also update Autoscoper to ensure
the corresponding compiler it found within the Autoscoper inner build.

Follow-up of f732df9 ("ENH: Update Autoscoper modernizing CUDA integration", 2024-02-12)

List of Autoscoper changes:

```
$ git shortlog 4d2eec33f..cebc017fe --no-merges
Jean-Christophe Fillion-Robin (1):
      COMP: Ensure Autoscoper inner-build is built with expected CUDA compiler on Linux

```

SuperBuild.cmake

@@ -35,7 +35,7 @@ if(DEFINED ENV{SlicerAutoscoperM_CUDA_PATH})
     endif()
   else()
     # See https://cmake.org/cmake/help/latest/envvar/CUDACXX.html#cudacxx
-    set(ENV{CUDACXX} $ENV{_cuda_path}/bin/nvcc)
+    set(ENV{CUDACXX} ${_cuda_path}/bin/nvcc)
   endif()
 endif()
 

SuperBuild/External_Autoscoper.cmake

@@ -35,7 +35,7 @@ if(NOT DEFINED ${proj}_DIR AND NOT ${SUPERBUILD_TOPLEVEL_PROJECT}_USE_SYSTEM_${p
 
   ExternalProject_SetIfNotDefined(
     Slicer_${proj}_GIT_TAG
-    "4d2eec33f2e60ad4e81031832915891c690862db"
+    "cebc017fe182f0a9e8292eaeb4a2fb173bc52af2"
     QUIET
   )