chore: update to ng11

Author: v.potekhin

angular.json

@@ -10,7 +10,7 @@
             "prefix": "lib",
             "architect": {
                 "build": {
-                    "builder": "@angular-devkit/build-ng-packagr:build",
+                    "builder": "@angular-devkit/build-angular:ng-packagr",
                     "options": {
                         "tsConfig": "projects/angular-contenteditable-accessor/tsconfig.lib.json",
                         "project": "projects/angular-contenteditable-accessor/ng-package.json"
@@ -79,7 +79,6 @@
                             "optimization": true,
                             "outputHashing": "all",
                             "sourceMap": false,
-                            "extractCss": true,
                             "namedChunks": false,
                             "aot": true,
                             "extractLicenses": true,
@@ -91,10 +90,10 @@
                                     "maximumWarning": "2mb",
                                     "maximumError": "5mb"
                                 },
-                {
-                  "type": "anyComponentStyle",
-                  "maximumWarning": "6kb"
-                }
+                                {
+                                    "type": "anyComponentStyle",
+                                    "maximumWarning": "6kb"
+                                }
                             ]
                         }
                     }