Replace deprecated util._extend with Object.assign to ensure compatibility with modern Node.js

I used patch-package to patch loopback-datasource-juggler@3.36.1 for the project I'm working on.

Here is the diff that solved my problem:

diff --git a/node_modules/loopback-datasource-juggler/lib/dao.js b/node_modules/loopback-datasource-juggler/lib/dao.js
index bd9c818..d62991e 100644
--- a/node_modules/loopback-datasource-juggler/lib/dao.js
+++ b/node_modules/loopback-datasource-juggler/lib/dao.js
@@ -207,9 +207,9 @@ DataAccessObject.applyProperties = function(data, inst) {
   let properties = this.definition.settings.properties;
   properties = properties || this.definition.settings.attributes;
   if (typeof properties === 'object') {
-    util._extend(data, properties);
+    Object.assign(data, properties);
   } else if (typeof properties === 'function') {
-    util._extend(data, properties.call(this, data, inst) || {});
+    Object.assign(data, properties.call(this, data, inst) || {});
   } else if (properties !== false) {
     const scope = this.defaultScope(data, inst) || {};
     if (typeof scope.where === 'object') {
diff --git a/node_modules/loopback-datasource-juggler/lib/model.js b/node_modules/loopback-datasource-juggler/lib/model.js
index 6ca3f33..e53ede5 100644
--- a/node_modules/loopback-datasource-juggler/lib/model.js
+++ b/node_modules/loopback-datasource-juggler/lib/model.js
@@ -24,7 +24,7 @@ const DataAccessUtils = require('./model-utils');
 const Observer = require('./observer');
 const Hookable = require('./hooks');
 const validations = require('./validations');
-const _extend = util._extend;
+const _extend = Object.assign;
 const utils = require('./utils');
 const fieldsToArray = utils.fieldsToArray;
 const uuid = require('uuid');
diff --git a/node_modules/loopback-datasource-juggler/lib/validations.js b/node_modules/loopback-datasource-juggler/lib/validations.js
index 82184e0..2f250ed 100644
--- a/node_modules/loopback-datasource-juggler/lib/validations.js
+++ b/node_modules/loopback-datasource-juggler/lib/validations.js
@@ -7,7 +7,7 @@
 
 const g = require('strong-globalize')();
 const util = require('util');
-const extend = util._extend;
+const extend = Object.assign;
 
 /*!
  * Module exports

This issue body was partially generated by patch-package.

Überprüfe lib/dao.js, lib/model.js und lib/validations.js und beginne mit jeder im Issue gezeigten Referenz auf util._extend oder _extend. Ersetze die veraltete Verwendung durch Object.assign, wobei die umgebenden Aufrufe erhalten bleiben, und überprüfe anschließend, dass die bestehenden Checks des Projekts erfolgreich sind und in diesen Dateien keine veralteten Referenzen verbleiben.