refactor: drop redundant headers (#763)

Author: WhiredPlanck

include/msvc/stdint.h

@@ -7,7 +7,6 @@
 #include <chrono>
 #include <exception>
 #include <utility>
-#include <boost/date_time/posix_time/posix_time_types.hpp>
 #include <filesystem>
 #include <rime/deployer.h>