Editorial: master is now ES2023

Co-authored-by: Shu-yu Guo <syg@chromium.org>
Co-authored-by: Jordan Harband <ljharb@gmail.com>

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "ipr-check": "node scripts/check-form tc39/ecma262 \"$TRAVIS_COMMIT\"",
     "prebuild-spec": "git remote rm travis-origin 2>/dev/null ; git remote add travis-origin \"git@github.com:${TRAVIS_REPO_SLUG:-tc39/ecma262}.git\" && git fetch --quiet travis-origin",
-    "build-spec": "YEAR=2021 && git checkout --quiet \"es${YEAR}\" && mkdir -p \"out/${YEAR}\" && cp -R img \"out/${YEAR}\" && ecmarkup --verbose spec.html \"out/${YEAR}/index.html\" --css \"out/${YEAR}/ecmarkup.css\" --js \"out/${YEAR}/ecmarkup.js\" && git checkout --quiet travis-origin/test-travis",
+    "build-spec": "YEAR=2022 && git checkout --quiet \"es${YEAR}\" && mkdir -p \"out/${YEAR}\" && cp -R img \"out/${YEAR}\" && ecmarkup --verbose spec.html \"out/${YEAR}/index.html\" --css \"out/${YEAR}/ecmarkup.css\" --js \"out/${YEAR}/ecmarkup.js\" && git checkout --quiet travis-origin/test-travis",
     "postbuild-spec": "git remote rm travis-origin",
     "build-head": "npm run build-only -- --lint-spec --strict",
     "prebuild-only": "npm run clean && mkdir out && cp -R img out",

spec.html

@@ -52,7 +52,7 @@
 
 </style>
 <pre class="metadata">
-  title: ECMAScript&reg; 2022 Language&nbsp;Specification
+  title: ECMAScript&reg; 2023 Language&nbsp;Specification
   shortname: ECMA-262
   status: draft
   location: https://tc39.es/ecma262/
@@ -91,7 +91,7 @@ <h1>Contributing to this Specification</h1>
 
 <emu-intro id="sec-intro">
   <h1>Introduction</h1>
-  <p>This Ecma Standard defines the ECMAScript 2022 Language. It is the thirteenth edition of the ECMAScript Language Specification. Since publication of the first edition in 1997, ECMAScript has grown to be one of the world's most widely used general-purpose programming languages. It is best known as the language embedded in web browsers but has also been widely adopted for server and embedded applications.</p>
+  <p>This Ecma Standard defines the ECMAScript 2023 Language. It is the fourteenth edition of the ECMAScript Language Specification. Since publication of the first edition in 1997, ECMAScript has grown to be one of the world's most widely used general-purpose programming languages. It is best known as the language embedded in web browsers but has also been widely adopted for server and embedded applications.</p>
   <p>ECMAScript is based on several originating technologies, the most well-known being JavaScript (Netscape) and JScript (Microsoft). The language was invented by Brendan Eich at Netscape and first appeared in that company's Navigator 2.0 browser. It has appeared in all subsequent browsers from Netscape and in all browsers from Microsoft starting with Internet Explorer 3.0.</p>
   <p>The development of the ECMAScript Language Specification started in November 1996. The first edition of this Ecma Standard was adopted by the Ecma General Assembly of June 1997.</p>
   <p>That Ecma Standard was submitted to ISO/IEC JTC 1 for adoption under the fast-track procedure, and approved as international standard ISO/IEC 16262, in April 1998. The Ecma General Assembly of June 1998 approved the second edition of ECMA-262 to keep it fully aligned with ISO/IEC 16262. Changes between the first and the second edition are editorial in nature.</p>
@@ -124,7 +124,7 @@ <h1>Introduction</h1>
 
 <emu-clause id="sec-scope">
   <h1>Scope</h1>
-  <p>This Standard defines the ECMAScript 2022 general-purpose programming language.</p>
+  <p>This Standard defines the ECMAScript 2023 general-purpose programming language.</p>
 </emu-clause>
 
 <emu-clause id="sec-conformance">