Update VS Code marketplace PAT

[trevor-scheer]

We had a successful NPM release, but failed to publish the VS Code extension due to an expired PAT. We need to update the secret and trigger another release of the extensions (probably just via a new changeset, patch bump, etc.)

Logs:
https://github.com/graphql/graphiql/actions/runs/25675031743/job/75370422131#step:5:708