Update ng-flutter embedding example to Angular v17 (#2081)

This should also fix the dependabot security alert currently open
against the repository
(https://github.com/flutter/samples/security/dependabot/8).

Author: parlough

web_embedding/ng-flutter/README.md

@@ -42,9 +42,9 @@ a moderately recent version of Angular:
 ```console
 $ ng version
 
-Angular CLI: 16.0.1
-Node: 18.16.0
-Package Manager: npm 9.5.1
+Angular CLI: 17.0.0
+Node: 20.9.0
+Package Manager: npm 10.1.0
 OS: linux x64
 ```
 
@@ -53,10 +53,10 @@ And Flutter:
 ```
 $ flutter --version
 
-Flutter 3.10.0-12.0.pre.38 • channel master
-Framework • revision 1a51dc2131 (8 days ago) • 2023-04-24 12:25:21 -0700
-Engine • revision 5fbde6c0fc
-Tools • Dart 3.1.0 (build 3.1.0-35.0.dev) • DevTools 2.23.1
+Flutter 3.13.9 • channel stable
+Framework • revision d211f42860 (2 weeks ago) • 2023-10-25 13:42:25 -0700
+Engine • revision 0545f8705d
+Tools • Dart 3.1.5 • DevTools 2.25.0
 ```
 
 **Ensure `npm`, `ng` and `flutter` are present in your `$PATH`.**

web_embedding/ng-flutter/angular.json

@@ -72,18 +72,18 @@
           "builder": "@angular-devkit/build-angular:dev-server",
           "configurations": {
             "production": {
-              "browserTarget": "ng-flutter:build:production"
+              "buildTarget": "ng-flutter:build:production"
             },
             "development": {
-              "browserTarget": "ng-flutter:build:development"
+              "buildTarget": "ng-flutter:build:development"
             }
           },
           "defaultConfiguration": "development"
         },
         "extract-i18n": {
           "builder": "@angular-devkit/build-angular:extract-i18n",
           "options": {
-            "browserTarget": "ng-flutter:build"
+            "buildTarget": "ng-flutter:build"
           }
         },
         "test": {