fix: upgrade pkijs from 2.1.90 to 2.4.0

Snyk has created this PR to upgrade pkijs from 2.1.90 to 2.4.0.

See this package in npm:
pkijs

See this project in Snyk:
https://app.snyk.io/org/mike.gorman/project/d891e25e-a3ea-41e3-8f10-c41424b83c95?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -121,7 +121,7 @@
     "micromodal": "^0.4.6",
     "multistream": "^4.1.0",
     "node-forge": "github:githoniel/forge",
-    "pkijs": "^2.1.90",
+    "pkijs": "^2.4.0",
     "promise-controller": "^1.0.0",
     "promise.prototype.finally": "^3.1.2",
     "q": "^1.5.1",