Force use of BoostConfig.cmake as requested by CMake 3.30

Without this change CMake 3.30 prints a warning, see CMP0167.

See !4706 (merged) too.

cmake/LHCbDependencies.cmake

 ###############################################################################
-# (c) Copyright 2000-2021 CERN for the benefit of the LHCb Collaboration      #
+# (c) Copyright 2000-2024 CERN for the benefit of the LHCb Collaboration      #
 #                                                                             #
 # This software is distributed under the terms of the GNU General Public      #
 # Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   #
@@ -39,7 +39,7 @@ if(NOT COMMAND _gaudi_runtime_prepend)
 endif()
 
 find_package(AIDA REQUIRED)
-find_package(Boost 1.62 REQUIRED
+find_package(Boost CONFIG REQUIRED
     container
     headers
     regex
@@ -76,7 +76,7 @@ lhcb_env(PRIVATE SET L0TCK ${TCK/L0TCK_ROOT_DIR}/options)
 
 # -- Private dependencies
 if(WITH_LHCb_PRIVATE_DEPENDENCIES)
-    find_package(Boost REQUIRED
+    find_package(Boost CONFIG REQUIRED
         date_time
         filesystem
         iostreams
@@ -90,6 +90,6 @@ if(WITH_LHCb_PRIVATE_DEPENDENCIES)
     )
 
     if(BUILD_TESTING)
-        find_package(Boost REQUIRED unit_test_framework)
+        find_package(Boost CONFIG REQUIRED unit_test_framework)
     endif()
 endif()