Postage stamp - Gas price fix

[Cafe137]

https://blockscout.com/xdai/mainnet/tx/0xe2f8a99c61550b167321a07bdc1acef509f8522039e99e83350bebad0c8b92a9

https://blockscout.com/xdai/mainnet/address/0xa9c84e9ccC0A0bC9B8C8E948F24E024bC2607c9A/transactions?block_number=24279411&id=0xa9c84e9ccC0A0bC9B8C8E948F24E024bC2607c9A&index=11&items_count=50

https://dashboard.tenderly.co/tx/xdai/0xe2f8a99c61550b167321a07bdc1acef509f8522039e99e83350bebad0c8b92a9

{
"[OPCODE]":"SSTORE"
"[INPUT]":"0x"
"[OUTPUT]":"0x"
"[ERROR]":"out of gas"
"gas":{
"gas_left":0
"gas_used":0
"total_gas_used":1600000
}

https://docs.ethswarm.org/debug-api/#tag/Postage-Stamps/paths/~1stamps~1%7Bamount%7D~1%7Bdepth%7D/post
gas-price

[Cafe137]

Related: ethersphere/bee#3321