fix(@angular-devkit/build-angular): correctly reference hmr-accept.js…

… file in windows error

Backslashes need to be changed to forward slashes for absolute imports to work in Windows.

Closes #19099

(cherry picked from commit 233e8e7)

packages/angular_devkit/build_angular/src/webpack/plugins/hmr/hmr-loader.ts

@@ -9,7 +9,7 @@
 import { join } from 'path';
 
 export const HmrLoader = __filename;
-const hmrAcceptPath = join(__dirname, './hmr-accept.js');
+const hmrAcceptPath = join(__dirname, './hmr-accept.js').replace(/\\/g, '/');
 
 export default function (
   this: import('webpack').loader.LoaderContext,