Update Auctions

Agents with this behavior update the current price of auction listings stored in their 'open_auctions' dictionary. This behavior is used in the Local Competition.

Paired Behaviors: (1) Collect Auctions (https://hash.ai/index/5e8fe08d35fa29bc106f4e8c/collect-auctions) (2) Collect Auction Winners (https://hash.ai/index/5e8fe5b535fa29181a6f4e96)