Fix deprecated warning from recent karam upgrade

Karam expects the config to be of type `Config`. This can be done by calling the karma.config.parseConfig method which creates a Config object that can be passed to karma.Server()

gulpfile.js

@@ -346,10 +346,10 @@ gulp.task(
 function runKarma(done) {
   const karma = require('karma');
   new karma.Server(
-    {
-      configFile: path.resolve(__dirname, './src/karma.config.js'),
-      ...karmaOptions,
-    },
+    karma.config.parseConfig(
+      path.resolve(__dirname, './src/karma.config.js'),
+      karmaOptions
+    ),
     done
   ).start();
 }