Update npm package httpyac to v6.16.2 (#5532)

Co-authored-by: hash-worker[bot] <180894564+hash-worker[bot]@users.noreply.github.com>

Author: hash-worker[bot]

tests/hash-graph-http/package.json

@@ -9,6 +9,6 @@
   },
   "devDependencies": {
     "@apps/hash-graph": "0.0.0-private",
-    "httpyac": "6.15.1"
+    "httpyac": "6.16.2"
   }
 }