Bump agentkeepalive from 4.2.1 to 4.3.0 in /lambda (#575)

Bumps [agentkeepalive](https://github.com/node-modules/agentkeepalive) from 4.2.1 to 4.3.0.
- [Release notes](https://github.com/node-modules/agentkeepalive/releases)
- [Changelog](https://github.com/node-modules/agentkeepalive/blob/master/History.md)
- [Commits](node-modules/agentkeepalive@4.2.1...4.3.0)

---
updated-dependencies:
- dependency-name: agentkeepalive
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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lambda/package.json

@@ -27,7 +27,7 @@
     "test:coverage": "c8 npm test"
   },
   "dependencies": {
-    "agentkeepalive": "^4.2.1",
+    "agentkeepalive": "^4.3.0",
     "axios": "^1.3.4",
     "sprintf-js": "^1.1.2",
     "uuid": "^9.0.0",