matrix: Enable SASL for Libera.Chat

roles/matrix/templates/irc-bridge.yaml.j2

@@ -83,7 +83,7 @@ ircService:
       sslselfsign: false
       # Should the connection attempt to identify via SASL (if a server or user password is given)
       # If false, this will use PASS instead. If SASL fails, we do not fallback to PASS.
-      sasl: false
+      sasl: true
       # Whether to allow expired certs when connecting to the IRC server.
       # Usually this should be off. Default: false.
       allowExpiredCerts: false