ENH: Update Slicer backporting SlicerSurfaceToolbox's MeshAligment updates

This commit updates the Slicer build to backport the MeshAlignment module
from the SlicerSALT fork of SlicerSurfaceToolbox. The changes correspond
to those proposed in Slicer/SlicerSurfaceToolbox#71, which are still under
review and not yet merged upstream.

The updated sources are downloaded from the SlicerSALT fork to ensure
availability of the latest improvements.

List of changes:

```
$ git shortlog e8b8f7093..26715cf15 --no-merges
Ye Han (1):
      [Backport PR-71] ENH: Add MeshAligment Module
```

Author: jcfr

SuperBuild.cmake

@@ -337,8 +337,8 @@ Slicer_Remote_Add(LandmarkRegistration
 list_conditional_append(Slicer_BUILD_LandmarkRegistration Slicer_REMOTE_DEPENDENCIES LandmarkRegistration)
 
 Slicer_Remote_Add(SurfaceToolbox
-  GIT_REPOSITORY "${EP_GIT_PROTOCOL}://github.com/Slicer/SlicerSurfaceToolbox"
-  GIT_TAG e8b8f70930883adb6f4a227ad9d7339d20120f2c
+  GIT_REPOSITORY "${EP_GIT_PROTOCOL}://github.com/slicersalt/SlicerSurfaceToolbox"
+  GIT_TAG 26715cf15e90bfd23fcbe35b09581bddb6267360 # slicersalt-2025-01-05-e8b8f70
   OPTION_NAME Slicer_BUILD_SurfaceToolbox
   OPTION_DEPENDS "Slicer_USE_PYTHONQT"
   LABELS REMOTE_MODULE