- fix failure in configure phase to detect boost serialization

--- CMakeLists.txt.orig	2024-06-05 12:07:40 UTC
+++ CMakeLists.txt
@@ -375,6 +375,7 @@ if (USE_PAGMO)
 endif ()
 
 if (USE_PAGMO)
+  find_package(Boost REQUIRED serialization)
   find_package (Pagmo CONFIG)
   if (Pagmo_FOUND)
     message (STATUS "Found Pagmo: ${Pagmo_DIR} (found version \"${Pagmo_VERSION}\")")
