chore: remove offerToken from required fields on flight specifications v3 (#139)

Signed-off-by: mohnoor94 <[email protected]>

Author: mohnoor94

specs/xap-flight-v3.specs.yaml

@@ -3810,7 +3810,6 @@ components:
         - International
         - Links
         - MerchantName
-        - offerToken
         - FareOptions
         - OpaqueFlight
         - OfferPrice