fix(deps): update dependency @netlify/serverless-functions-api to v1.6.0 (#5935)

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

Author: renovate[bot]

Diff for: package-lock.json

@@ -83,7 +83,7 @@
     "@netlify/config": "20.8.0",
     "@netlify/edge-bundler": "8.18.0",
     "@netlify/local-functions-proxy": "1.1.1",
-    "@netlify/serverless-functions-api": "1.5.2",
+    "@netlify/serverless-functions-api": "1.6.0",
     "@netlify/zip-it-and-ship-it": "9.16.0",
     "@octokit/rest": "19.0.13",
     "ansi-escapes": "6.2.0",