Update dependency karma-sauce-launcher to v4

Author: renovate-bot

package-lock.json

@@ -32,7 +32,7 @@
     "karma-phantomjs-launcher": "1.0.4",
     "karma-remap-coverage": "0.1.5",
     "karma-rollup-preprocessor": "7.0.5",
-    "karma-sauce-launcher": "2.0.2",
+    "karma-sauce-launcher": "4.1.2",
     "karma-sourcemap-loader": "0.3.7",
     "lint-staged": "10.1.1",
     "mocha": "7.1.1",