fix(deps): update dependency express to v4.17.1

Author: renovate-bot

package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "did-resolver": "3.1.0",
     "ethr-did-resolver": "4.3.3",
-    "express": "4.16.2",
+    "express": "4.17.1",
     "nacl-did": "1.0.1",
     "web-did-resolver": "2.0.4"
   },