Update codeowners to element-hq teams

[dbkr]

Checklist

• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• Sign-off given on the changes (see CONTRIBUTING.md).

[langleyd]

Looks like this team doesn't exist on element-hq.

Should that be created or use element-crypto for now @richvdh

[dbkr]

It should do, I just created it: https://github.com/orgs/element-hq/teams/element-crypto-web-reviewers

[dbkr]

I guess it can't be a secret team - I've changed it to public but it might take a while for GH to realise and update the codeowners file check.

[dbkr]

Nope, obviously it was because I forgot to add the team's access to the repo 🤦

[CLAassistant]

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