Switched to nanoid for key generation

To try and prevent any security issues, use an external package to
generate key instead of doing it ourselves. Note: we have to use nanoid
version 3 as nanoid version 4 requires ESM. Currently, nanoid v3 is
still supported.

Signed-off-by: Matthew Nickson <mnickson@sidingsmedia.com>

package.json

@@ -103,6 +103,7 @@
         "mqtt": "~4.3.7",
         "mssql": "~8.1.4",
         "mysql2": "~2.3.3",
+        "nanoid": "^3.3.4",
         "node-cloudflared-tunnel": "~1.0.9",
         "node-radius-client": "~1.0.0",
         "nodemailer": "~6.6.5",