Updating the organizer names list with Mathew Joseph

[Santosh-Kumar-Perumal]

Adding CNCF Community page that validates Mathew Joseph is one of the oraganizer.

https://community.cncf.io/events/details/cncf-cloud-native-westminster-presents-cncf-sustainability-week-2024-london-meetup/

@guidemetothemoon, @leonardpahlke or @rohitg00 please help on this.

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[rohitg00]

LGTM