fix: add superagent types as prod dependency (#347)

We expose superagent's types in our own types, so this should be a
production dependency. Otherwise, we will cause errors in the typescript
builds of consumers (unless they skip lib check).

It does mean we add an unnecessary dependency for non-ts people, but
there's not any simple way around that.

Author: 43081j

package-lock.json

@@ -57,12 +57,12 @@
     "is-ip": "^5.0.1",
     "methods": "^1.1.2",
     "qs": "^6.12.1",
+    "@types/superagent": "^8.1.7",
     "superagent": "^9"
   },
   "devDependencies": {
     "@eslint/js": "^9.3.0",
     "@types/chai": "^4.3.16",
-    "@types/superagent": "^8.1.7",
     "chai": "^5.1.0",
     "coveralls": "^3.1.1",
     "eslint": "^9.3.0",