fix: Visual Studio warnings for narrowing conversion

Author: Knightly1

include/yaml-cpp/emitter.h

@@ -189,7 +189,7 @@ inline Emitter& Emitter::WriteStreamable(T value) {
   }
 
   if (!special) {
-    auto value_as_str = FpToString(value, stream.precision());
+    auto value_as_str = FpToString(value, static_cast<size_t>(stream.precision()));
     if (GetShowTrailingZero()) {
         bool isInScientificNotation = (value_as_str.find('e') != std::string::npos);
         bool hasDot                 = (value_as_str.find('.') != std::string::npos);

include/yaml-cpp/node/convert.h

@@ -130,7 +130,7 @@ inner_encode(const T& rhs, std::stringstream& stream){
       stream << ".inf";
     }
   } else {
-    stream << FpToString(rhs, stream.precision());
+    stream << FpToString(rhs, static_cast<size_t>(stream.precision()));
   }
 }