feat: bump package version to 1.2.0 and update @types/node dev dependency.

Author: alexasomba

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@alexasomba/paystack-node",
-  "version": "1.1.1",
+  "version": "1.2.0",
   "description": "Paystack API client for Node.js (TypeScript)",
   "license": "MIT",
   "author": "alexasomba",
@@ -49,7 +49,7 @@
     "openapi-fetch": "^0.15.0"
   },
   "devDependencies": {
-    "@types/node": "^22.19.7",
+    "@types/node": "^22.19.9",
     "openapi-typescript": "^7.10.1",
     "typescript": "^5.9.3",
     "yaml": "^2.8.2"