cxgbe(4): Update firmwares to version 1.27.3.0

These are the changes since the last update (copy-pasted from the
release notes for Chelsio Unified Wire v3.18.0.0):

Version : 1.27.3.0
Date : 04/07/2023

Fixes

BASE:

• Fixed a hang if module eeprom reads gives invalid data.
• KR backlplane no-fec link problem fixed.

OFLD:

• iscsi ddp errors fixed.
• iwarp connection abort in rare cases causing NIC traffic hang fixed.

ENHANCEMENTS

BASE:

• Cisco GLC-TE 1G modules support added.

Version : 1.27.1.0
Date : 12/02/2022

Fixes

BASE:

• memwrite dsgl cannot be used for T5.

OFLD:

• Enabled FCoE in SO adapters.
• TOE-TLS crash fixed.
• iscsi hang fixed.

Sponsored by: Chelsio Communications

(cherry picked from commit ca5391bd8579fd404dc31880b4d8744f43d22adb)