fix: update monterail link (#2481)

Author: edimitchel

src/partners/partners.json

@@ -77,7 +77,7 @@
     "region": ["Europe"],
     "website": {
       "text": "www.monterail.com",
-      "url": "https://www.monterail.com/services/vue-js-development/?utm_source=vuejs.org"
+      "url": "https://www.monterail.com/services/vue/?utm_source=vuejs.org"
     },
     "contact": "hello@monterail.com",
     "hiring": "https://www.monterail.com/careers?utm_source=vuejs.org&utm_medium=referral&utm_campaign=partner-hiring-link",