📝 Add external link to article: Deploying ML Models as API Using FastAPI and Heroku (#3904)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

docs/en/data/external_links.yml

@@ -1,5 +1,9 @@
 articles:
   english:
+  - author: Kaustubh Gupta
+    author_link: https://medium.com/@kaustubhgupta1828/
+    link: https://www.analyticsvidhya.com/blog/2021/06/deploying-ml-models-as-api-using-fastapi-and-heroku/
+    title: Deploying ML Models as API Using FastAPI and Heroku
   - link: https://jarmos.netlify.app/posts/using-github-actions-to-deploy-a-fastapi-project-to-heroku/
     title: Using GitHub Actions to Deploy a FastAPI Project to Heroku
     author_link: https://jarmos.netlify.app/