fix: use plural reviewers actor type for Vaunt

[jeff1010322]

PR Description

The Vaunt config specification uses "reviewers" rather than "reviewer" for the actor type on pull_requests to award achievements based on review contributions.

Updating the config to match so these can be awarded.

Related Issue

N/A

Checklist

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• Did you add the tests?
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[NripeshN]

Thanks!!