Use main branch instead of master

Author: Malmahrouqi3

toolchain/dependencies/CMakeLists.txt

@@ -82,6 +82,7 @@ if (MFC_SILO)
 
         ExternalProject_Add(silo
             GIT_REPOSITORY "https://github.com/LLNL/Silo"
+            GIT_TAG        main
             GIT_PROGRESS   ON
             PATCH_COMMAND  "${GIT_EXECUTABLE}" stash
                         && "${GIT_EXECUTABLE}" apply "${CMAKE_SOURCE_DIR}/Silo.patch"