fix(fiat-api): fiatVersion 1.7.1

[cfieber]

Fixes serialization issue in fiat-api version mismatch with new values in Authorizations enum

[spinnakerbot]

The following commits need their title changed:

• 6a2c6e1: Revert "chore(dependencies): fiatVersion 1.7.0 (chore(dependencies): fiatVersion 1.7.0 #529)"

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