fix: minor constants change

Author: SukkaW

lib/core/constants.js

@@ -102,10 +102,8 @@ const wellknownHeaderNames = /** @type {const} */ ([
 ])
 
 /** @type {Record<typeof wellknownHeaderNames[number]|Lowercase<typeof wellknownHeaderNames[number]>, string>} */
-const headerNameLowerCasedRecord = {}
-
 // Note: object prototypes should not be able to be referenced. e.g. `Object#hasOwnProperty`.
-Object.setPrototypeOf(headerNameLowerCasedRecord, null)
+const headerNameLowerCasedRecord = Object.create(null);
 
 for (let i = 0; i < wellknownHeaderNames.length; ++i) {
   const key = wellknownHeaderNames[i]