FindPython: fix erroneous variable handling

Fixes: #21817

Modules/FindPython/Support.cmake

@@ -1528,7 +1528,7 @@ if ("Interpreter" IN_LIST ${_PYTHON_PREFIX}_FIND_COMPONENTS)
       if (${_PYTHON_PREFIX}_FIND_VERSION_RANGE)
         list (APPEND _${_PYTHON_PREFIX}_VALIDATE_OPTIONS IN_RANGE)
       elseif (DEFINED ${_PYTHON_PREFIX}_FIND_VERSION)
-        list (APPEND VERSION ${${_PYTHON_PREFIX}_FIND_VERSION})
+        list (APPEND _${_PYTHON_PREFIX}_VALIDATE_OPTIONS VERSION ${${_PYTHON_PREFIX}_FIND_VERSION})
       endif()
 
       while (TRUE)
@@ -1996,7 +1996,7 @@ if ("Compiler" IN_LIST ${_PYTHON_PREFIX}_FIND_COMPONENTS)
       if (${_PYTHON_PREFIX}_FIND_VERSION_RANGE)
         list (APPEND _${_PYTHON_PREFIX}_VALIDATE_OPTIONS IN_RANGE)
       elseif (DEFINED ${_PYTHON_PREFIX}_FIND_VERSION)
-        list (APPEND VERSION ${${_PYTHON_PREFIX}_FIND_VERSION})
+        list (APPEND _${_PYTHON_PREFIX}_VALIDATE_OPTIONS VERSION ${${_PYTHON_PREFIX}_FIND_VERSION})
       endif()
 
       while (TRUE)