Update webdrivers gem

[zachmargolis]

Relevant Ticket or Conversation:

N/A

Description of Changes:

Newer version supports M1 macs, see 18F/identity-idp#7133

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1. Have you linted and tested your code locally prior to submission?
2. Have you tagged the appropriate dev(s) for review?
3. Have you linked to any relevant tickets or conversations?

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