Update dependency lint-staged to v9.2.1

Author: renovate-bot

package-lock.json

@@ -34,7 +34,7 @@
     "karma-rollup-preprocessor": "7.0.2",
     "karma-sauce-launcher": "2.0.2",
     "karma-sourcemap-loader": "0.3.7",
-    "lint-staged": "9.2.0",
+    "lint-staged": "9.2.1",
     "mocha": "6.2.0",
     "npm-run-all": "4.1.5",
     "phantomjs-prebuilt": "2.1.16",