chore: package.json & package-lock.json to reduce vulnerabilities (hirosystems#2269)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-FASTIFY-9788069

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: blockstack-devops

package-lock.json

@@ -120,7 +120,7 @@
     "escape-goat": "3.0.0",
     "evt": "1.10.1",
     "express": "4.21.2",
-    "fastify": "4.28.1",
+    "fastify": "4.29.1",
     "fastify-metrics": "11.0.0",
     "getopts": "2.3.0",
     "http-proxy-middleware": "2.0.7",