fix: replace is-utf8 with native nodejs functions

Available since nodejs 18.14
https://nodejs.org/docs/latest-v18.x/api/buffer.html#bufferisutf8input

package.json

@@ -51,7 +51,6 @@
         "https-proxy-agent": "5.0.1",
         "i18next": "21.10.0",
         "iconv-lite": "0.6.3",
-        "is-utf8": "0.2.1",
         "js-yaml": "4.1.0",
         "json-stringify-safe": "5.0.1",
         "jsonata": "2.0.5",
@@ -123,6 +122,6 @@
         "supertest": "6.3.3"
     },
     "engines": {
-        "node": ">=18.5"
+        "node": ">=18.14"
     }
 }

packages/node_modules/@node-red/nodes/core/function/90-exec.js

@@ -19,7 +19,7 @@ module.exports = function(RED) {
     var spawn = require('child_process').spawn;
     var exec = require('child_process').exec;
     var fs = require('fs');
-    var isUtf8 = require('is-utf8');
+    const { isUtf8 } = require('node:buffer');
     const isWindows = process.platform === 'win32'
 
     function ExecNode(n) {
@@ -87,7 +87,7 @@ module.exports = function(RED) {
                     });
                     var cmd = arg.shift();
                     // Since 18.20.2/20.12.2, it is invalid to call spawn on Windows with a .bat/.cmd file
-                    // without using shell: true. 
+                    // without using shell: true.
                     const opts = isWindows ? { ...node.spawnOpt, shell: true } : node.spawnOpt
                     /* istanbul ignore else  */
                     node.debug(cmd+" ["+arg+"]");

packages/node_modules/@node-red/nodes/core/network/10-mqtt.js

@@ -18,7 +18,7 @@ module.exports = function(RED) {
     "use strict";
     const { getProxyForUrl } = require('./lib/proxyHelper');
     var mqtt = require("mqtt");
-    var isUtf8 = require('is-utf8');
+    const { isUtf8 } = require('node:buffer');
     var HttpsProxyAgent = require('https-proxy-agent');
     var url = require('url');
     const knownMediaTypes = {

packages/node_modules/@node-red/nodes/core/network/21-httpin.js

@@ -24,7 +24,7 @@ module.exports = function(RED) {
     var onHeaders = require('on-headers');
     var typer = require('content-type');
     var mediaTyper = require('media-typer');
-    var isUtf8 = require('is-utf8');
+    const { isUtf8 } = require('node:buffer');
     var hashSum = require("hash-sum");
 
     function rawBodyParser(req, res, next) {

packages/node_modules/@node-red/nodes/package.json

@@ -32,7 +32,6 @@
         "hash-sum": "2.0.0",
         "hpagent": "1.2.0",
         "https-proxy-agent": "5.0.1",
-        "is-utf8": "0.2.1",
         "js-yaml": "4.1.0",
         "media-typer": "1.1.0",
         "mqtt": "5.7.0",

packages/node_modules/node-red/package.json

@@ -48,6 +48,6 @@
         "@node-rs/bcrypt": "1.10.4"
     },
     "engines": {
-        "node": ">=18.5"
+        "node": ">=18.14"
     }
 }