fix(@angular-devkit/build-angular): update browerslist package

The `supports` query was added in version `4.13`, while `^4.9.1` does match this version is some cases an older version might be used to the presence of a lock file during the update which would cause the package not to be update.

Closes angular#24212

Author: alan-agius4

package.json

@@ -132,7 +132,7 @@
     "babel-loader": "9.1.0",
     "babel-plugin-istanbul": "6.1.1",
     "bootstrap": "^4.0.0",
-    "browserslist": "^4.9.1",
+    "browserslist": "4.21.4",
     "cacache": "17.0.2",
     "chokidar": "3.5.3",
     "copy-webpack-plugin": "11.0.0",

packages/angular_devkit/build_angular/package.json

@@ -25,7 +25,7 @@
     "autoprefixer": "10.4.13",
     "babel-loader": "9.1.0",
     "babel-plugin-istanbul": "6.1.1",
-    "browserslist": "^4.9.1",
+    "browserslist": "4.21.4",
     "cacache": "17.0.2",
     "chokidar": "3.5.3",
     "copy-webpack-plugin": "11.0.0",