fix: increase buffer to fit exponents for double values

include/yaml-cpp/fp_to_string.h

@@ -102,7 +102,7 @@ auto fp_to_string(T v, int precision) -> std::string {
         }
     }
 
-    std::array<char, 26> output_buffer; // max digits of size_t plus sign, a dot and 4 letters for the exponent
+    std::array<char, 28> output_buffer; // max digits of size_t plus sign, a dot and 2 letters for 'e+' or 'e-' and 4 letters for the exponent
     auto output_ptr = &output_buffer[0];
 
     // print '-' symbol for negative numbers