deps: update agentkeepalive requirement from ^4.2.0 to ^4.2.1 (#102)

Updates the requirements on [agentkeepalive](https://github.com/node-modules/agentkeepalive) to permit the latest version.
- [Release notes](https://github.com/node-modules/agentkeepalive/releases)
- [Changelog](https://github.com/node-modules/agentkeepalive/blob/master/History.md)
- [Commits](node-modules/agentkeepalive@4.2.0...4.2.1)

---
updated-dependencies:
- dependency-name: agentkeepalive
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -33,7 +33,7 @@
   "author": "GitHub Inc.",
   "license": "ISC",
   "dependencies": {
-    "agentkeepalive": "^4.2.0",
+    "agentkeepalive": "^4.2.1",
     "cacache": "^15.3.0",
     "http-cache-semantics": "^4.1.0",
     "http-proxy-agent": "^5.0.0",