Use hex encoded event attributes for ibc `packet_data` and `packet_ack`

[damiannolan]

The deprecated ibc event attributes have now been removed:

• packet_data
• packet_ack

These are superseded by the hex encoded event attributes:

• packet_data_hex
• packet_ack_hex

See cosmos/ibc-go#6023

Surfaced from failing e2e tests leveraging hyperspace relayer.