Update dependency express-validator to v6.14.2

Author: renovate[bot]

package-lock.json

@@ -19,7 +19,7 @@
     "express": "4.16.4",
     "express-mysql-session": "2.1.8",
     "express-session": "1.17.3",
-    "express-validator": "6.11.1",
+    "express-validator": "6.14.2",
     "helmet": "3.23.3",
     "html5shiv": "3.7.3",
     "http-errors": "1.6.3",