Upgrade proper-lockfile

Author: linonetwo

package.json

@@ -92,7 +92,7 @@
     "nodemailer": "^3.1.4",
     "oidc-op-express": "^0.0.3",
     "owasp-password-strength-test": "^1.3.0",
-    "proper-lockfile": "^3.2.0",
+    "proper-lockfile": "^4.1.1",
     "rdflib": "^0.21.1",
     "recursive-readdir": "^2.1.0",
     "rimraf": "^2.7.1",