fix: change url to newsletter

Author: brunopulis

topics/newsletter.md

@@ -2,7 +2,7 @@
 
 - [Accessibility Weekly](http://a11yweekly.com/)
 - [Axess Lab Newsletter](https://axesslab.com/newsletter/)
-- [Bruno Pulis Newsletter](https://brunopulis.substack.com) 
+- [Bruno Pulis Newsletter](https://subscribepage.io/cartas) 
 - [Deque News](https://www.deque.com/get-accessibility-help/deque-news/)
 - [Microassist](https://www.microassist.com/about/newsletter-subscriptions/)
 - [University of Minnesota Duluth Webdev Newsletter](https://www.d.umn.edu/itss/training/online/webdesign/webdev_listserv.html)