Bump @angular-devkit/build-angular in /angular/ng-docker

Bumps [@angular-devkit/build-angular](https://github.com/angular/angular-cli) from 0.803.8 to 0.803.9.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Commits](https://github.com/angular/angular-cli/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

angular/ng-docker/package-lock.json

@@ -25,7 +25,7 @@
     "zone.js": "^0.9.1"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "~0.803.8",
+    "@angular-devkit/build-angular": "~0.803.9",
     "@angular/cli": "^8.3.8",
     "@angular/compiler-cli": "^8.2.7",
     "@angular/language-service": "^8.2.10",