Update shell-quote to 1.7.3 in /tests (#6736)

Author: joechung-msft

tests/package-lock.json

@@ -17,10 +17,10 @@
   "devDependencies": {
     "axe-core": "^3.1.2",
     "cypress": "^3.1.5",
-    "npm-run-all": "^4.1.5",
-    "serve": "^10.1.2",
+    "cypress-plugin-retries": "^1.0.3",
     "ms-rest-azure": "^2.6.0",
-    "cypress-plugin-retries": "^1.0.3"
+    "npm-run-all": "^4.1.5",
+    "serve": "^10.1.2"
   },
   "engines": {
     "yarn": "NO LONGER USED - Please use npm"