system settings/hardware/sound. Check to see if the correct output device you need is picked as default as primary. If you are using an external 3rd party device the update may have returned this setting back to default PC speakers.
Also check to see if it is muted or the sound has been turned down.
But first, check your keyboard controls to make sure the mute/volume keys were not accidentally pressed by the cat... Might just be the keyboard button options preventing it. The keyboard is another entity of it’s own with options that override software settings. :)
Changing the output device doesn’t seem to make a difference. Bluetooth works, speakers don’t.
(What can I do on the keyboard? I’m not aware of any ‘mute/volume actions that may have happened, cat involvement or not.)