ENH: Support elastix version 5.2, when using ITK >= 5.4

elastix 5.2 is the latest elastix release. It has various enhancements,
performance improvements and bug fixes:
https://github.com/SuperElastix/elastix/releases/tag/5.2.0

elastix version 5.2, requires ITK >= 5.4.

The main branch of Slicer was upgraded to ITK 5.4.0 by Dženan Zukić, Jun 3, 2024,
pull request Slicer/Slicer#7771
commit Slicer/Slicer@acf3dd4

SuperBuild/External_elastix.cmake

@@ -30,8 +30,13 @@ if(NOT DEFINED ${proj}_DIR AND NOT ${CMAKE_PROJECT_NAME}_USE_SYSTEM_${proj})
     set(ELASTIX_GIT_REPOSITORY "$https://github.com/SuperElastix/elastix.git")
     set(ELASTIX_GIT_TAG "419313e9cc12727d73c7e6e47fbdf960aa1218b9") # latest commit on "develop" branch as if 2019-10-13
   else()
-    set(ELASTIX_GIT_REPOSITORY "https://github.com/SuperElastix/elastix.git")
-    set(ELASTIX_GIT_TAG "5.1.0") # 2023-01-12
+    if(DEFINED ITK_VERSION_MAJOR AND ${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR} VERSION_LESS 5.4)
+      set(ELASTIX_GIT_REPOSITORY "https://github.com/SuperElastix/elastix.git")
+      set(ELASTIX_GIT_TAG "5.1.0") # 2023-01-12
+    else()
+      set(ELASTIX_GIT_REPOSITORY "https://github.com/SuperElastix/elastix.git")
+      set(ELASTIX_GIT_TAG "5.2.0") # 2024-07-18
+    endif()
   endif()
 
   ExternalProject_Add(${proj}