Revert "build: Specify zeromq port explicitly for MSVC builds"

This reverts commit 20b6c87117.

build_msvc/vcpkg.json

@@ -13,13 +13,5 @@
       "features": ["thread"]
     },
     "zeromq"
-  ],
-  "builtin-baseline": "b86c0c35b88e2bf3557ff49dc831689c2f085090",
-  "overrides": [
-    {
-      "name": "zeromq",
-      "version": "4.3.4",
-      "port-version": 3
-    }
   ]
 }