does "Idempotency-Key" header work?

[mt-nobuo-tsuchiya]

Describe the bug In method _post_request() , idempotency_key parameter doesnt work
Maybe it's simply bug on (sdk.py, line:1595)

To Reproduce call method(e.g. create_transaction) twice with same idempotency_key parameter (it always makes two transactions)

Expected behavior keep idempotency (when set idempotency_key parameter, add Idempotency-Key header)

Versions (please complete the following information):

• Python Version: 3.9
• fireblocks-sdk version: 1.18.1

[mt-nobuo-tsuchiya]

thanks for the fix! (and sorry for my bad english)