add scaling postgres free podcast (#4454)

Co-authored-by: sarit <sarit.pinhas@duda.co>

free-podcasts-screencasts-en.md

@@ -267,6 +267,7 @@
 ### PostgreSQL
 
 * [PG Casts](https://www.pgcasts.com) (screencast)
+* [Scaling Postgres](https://player.fm/series/scaling-postgres) - Ruby Tree Software Inc and Creston Jamison (podcast)
 
 
 ### Python