Upgrade the SAI version to 7.1.73.4 to include the following fix:
7.1.67.4: [CSP CS00012302165] Backport JIRA SONIC-77116 to rel_ocp_sai_7_1
7.1.68.4: [CSP CS00012316299][SAI_BRANCH rel_ocp_sai_7_1] L3 entry delete failed when SER error is present
7.1.69.4: ECMP LB traffic polarization, configure hash_offset along with hash_seed attr
7.1.70.4: JIRA# SONIC-79944
7.1.71.4: SID: MMU cosq control configuration with Dynamic Type Check
7.1.72.4: BACKPORT SONIC-81858 PFCWD on IPv6 JIRA# SONIC-84146]SONIC-81858
7.1.73.4: [CSP CS00012322843] SAI_API_ROUTE:brcm_sai_xgs_route_create:115 iptnl info get failed with error -7
Signed-off-by: zitingguo-ms <zitingguo@microsoft.com>
4d878b1345