build(deps-dev): bump @schematics/angular from 7.3.1 to 7.3.9

Bumps [@schematics/angular](https://github.com/angular/angular-cli) from 7.3.1 to 7.3.9.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Commits](angular/angular-cli@v7.3.1...v7.3.9)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -48,7 +48,7 @@
     "@angular/cli": "^7.3.8",
     "@angular/compiler-cli": "^7.2.3",
     "@angular/language-service": "^7.2.12",
-    "@schematics/angular": "^7.3.1",
+    "@schematics/angular": "^7.3.9",
     "@types/jasmine": "^3.3.12",
     "@types/jasminewd2": "^2.0.6",
     "@types/node": "^11.13.8",