Drop Node.js 10 support for development "build" (#10842)

scripts/build/build.js

@@ -135,6 +135,7 @@ async function cacheFiles(cache) {
 async function preparePackage() {
   const pkg = await util.readJson("package.json");
   pkg.bin = "./bin-prettier.js";
+  pkg.engines.node = ">=10.13.0";
   delete pkg.dependencies;
   delete pkg.devDependencies;
   pkg.scripts = {