docs: infra pg

Author: peterpeterparker

CHANGELOG.md

@@ -13,6 +13,7 @@
 - kit: v2.1.0 ([CHANGELOG](https://github.com/deckgo/deckdeckgo/blob/master/kit/CHANGELOG.md))
 - starter kit: v7.1.5 ([CHANGELOG](https://github.com/deckgo/starter-kit/blob/master/CHANGELOG.md))
 - studio kit: v7.2.1 ([CHANGELOG](https://github.com/deckgo/studio-kit/blob/master/CHANGELOG.md))
+- infra: upgrade PG (v9.6 to v12.5)
 
 <a name="4.2.0"></a>