Add missing #include <algorithm> for std::min/std::max uses, and #include <limits> for std::numeric_limits<> (#7624)

tests/flexbuffers_test.cpp

@@ -1,3 +1,5 @@
+#include <limits>
+
 #include "flexbuffers_test.h"
 
 #include "flatbuffers/flexbuffers.h"
@@ -289,4 +291,4 @@ void ParseFlexbuffersFromJsonWithNullTest() {
 }
 
 }  // namespace tests
-}  // namespace flatbuffers
+}  // namespace flatbuffers