Bump @angular/cli from 1.7.2 to 7.3.1 in /client

Bumps [@angular/cli](https://github.com/angular/angular-cli) from 1.7.2 to 7.3.1.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Commits](angular/angular-cli@v1.7.2...v7.3.1)

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

client/package.json

@@ -35,7 +35,7 @@
     "zone.js": "^0.8.29"
   },
   "devDependencies": {
-    "@angular/cli": "1.7.2",
+    "@angular/cli": "7.3.1",
     "@angular/compiler-cli": "^5.0.0",
     "@angular/language-service": "^7.2.3",
     "@types/jasmine": "~2.6.0",