Replace boost::filesystem with std (#6432)

src/benchmarks/static_rtree.cpp

@@ -11,11 +11,10 @@
 #include "util/serialization.hpp"
 #include "util/timing_util.hpp"
 
+#include <fstream>
 #include <iostream>
 #include <random>
 
-#include <boost/filesystem/fstream.hpp>
-
 namespace osrm::benchmarks
 {