fix(deps): update dependency node-opcua-pki to v6.18.0 (#1409)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -32,7 +32,7 @@
     "chalk": "4.1.2",
     "node-opcua": "2.173.1",
     "node-opcua-file-transfer": "2.173.1",
-    "node-opcua-pki": "6.17.0",
+    "node-opcua-pki": "6.18.0",
     "node-opcua-pubsub-expander": "^0.19.2",
     "node-opcua-pubsub-server": "^0.19.2",
     "node-opcua-server-discovery": "2.173.1",