chore(package.json): Nightwatch 1.6.3 -> 1.7.3

Author: vaibhavsingh97

packages/@vue/cli-plugin-e2e-nightwatch/package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "@vue/cli-shared-utils": "^5.0.0-beta.1",
     "deepmerge": "^4.2.2",
-    "nightwatch": "^1.6.4"
+    "nightwatch": "^1.7.3"
   },
   "devDependencies": {
     "chromedriver": "^91.0.0",