fix(@schematics/angular): update karma for new workspaces to 5.2.0

Author: alan-agius4

packages/schematics/angular/workspace/files/package.json.template

@@ -31,7 +31,7 @@
     "codelyzer": "^6.0.0",
     "jasmine-core": "~3.6.0",
     "jasmine-spec-reporter": "~5.0.0",
-    "karma": "~5.0.0",
+    "karma": "~5.2.0",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage-istanbul-reporter": "~3.0.2",
     "karma-jasmine": "~4.0.0",