MR to update technical committee details

Hi,

I've opened an MR to reflect the recent changes to the technical 
committee's membership, and that I am no longer chair:
https://salsa.debian.org/webmaster-team/webwml/-/merge_requests/1126

I hope that's sufficient, but if you need anything else from me, please 
let me know (and CC me, please, I'm not subscribed to this list).

Thanks,

Matthew