Update signet from 0.14.0 to 0.17.0

What does this MR do and why?

Updates signet gem from 0.14.0 to 0.17.0, which allows us to use Faraday v2 in the future.

signet gem was used only from google-api-client and googleauth gems.

Change in the upstream: https://github.com/googleapis/signet/compare/signet/v0.14.0...signet/v0.17.0

Part of #369862 (closed)

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