[Arista] Update phy-credo gearbox code (sonic-net#6973)

This package was outdated and did not properly install on buster due to dependency changes.
This version should work on all DCS-7280CR3*-32[PD]4 platforms.

Signed-off-by: Samuel Angebault <staphylo@arista.com>

rules/phy-credo.mk

@@ -1,3 +1,3 @@
 PHY_CREDO = phy-credo_1.0_amd64.deb
-$(PHY_CREDO)_URL = "https://github.com/aristanetworks/sonic-firmware/raw/78a3df2/phy/phy-credo_1.0_amd64.deb"
+$(PHY_CREDO)_URL = "https://github.com/aristanetworks/sonic-firmware/raw/6d0d1661d92a342acedb6839dba970ae5778b478/phy/phy-credo_1.0_amd64.deb"
 SONIC_ONLINE_DEBS += $(PHY_CREDO)