MAINTAINERS: Update IRC link for Surface System Aggregator subsystem

We have moved to libera.chat. Update the link accordingly.
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20210614194635.1681519-1-luzmaximilian@gmail.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

MAINTAINERS

@@ -12190,7 +12190,7 @@ M:	Maximilian Luz <luzmaximilian@gmail.com>
 L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
 W:	https://github.com/linux-surface/surface-aggregator-module
-C:	irc://chat.freenode.net/##linux-surface
+C:	irc://irc.libera.chat/linux-surface
 F:	Documentation/driver-api/surface_aggregator/
 F:	drivers/platform/surface/aggregator/
 F:	drivers/platform/surface/surface_acpi_notify.c