Merge pull request haskell#9085 from haskell/ulysses4ever-patch-1

README: update Matrix chat link

Author: mergify[bot]

README.md

@@ -4,7 +4,7 @@
 [![Stackage version](https://www.stackage.org/package/Cabal/badge/lts?label=Stackage)](https://www.stackage.org/package/Cabal)
 [![Documentation Status](http://readthedocs.org/projects/cabal/badge/?version=latest)](http://cabal.readthedocs.io/en/latest/?badge=latest)
 [![IRC chat](https://img.shields.io/badge/chat-via%20libera-brightgreen.svg)](https://web.libera.chat/#hackage)
-[![Matrix chat](https://img.shields.io/badge/chat-via%20matrix-brightgreen.svg)](https://matrix.to/#/#hackage:libera.chat)
+[![Matrix chat](https://img.shields.io/badge/chat-via%20matrix-brightgreen.svg)](https://matrix.to/#/#hackage:matrix.org)
 
 <img src="https://www.haskell.org/cabal/images/Cabal-light.png" align="right">