[202012] Update SAI version to 4.3.7.1-7 (#13431)

CS00012254651 (SONIC-66820) Fix missing break stmt

Verify

run case test_forward_ip_packet_with_0xffff_chksum_tolerant

Signed-off-by: richardyu-ms <[email protected]>

Author: richardyu-ms

platform/broadcom/sai.mk

@@ -1,5 +1,5 @@
-LIBSAIBCM_XGS_VERSION = 4.3.7.1-6
-LIBSAIBCM_BRANCH_NAME = REL_4.3.5.2
+LIBSAIBCM_XGS_VERSION = 4.3.7.1-7
+LIBSAIBCM_BRANCH_NAME = REL_4.3_202012
 LIBSAIBCM_XGS_URL_PREFIX = "https://sonicstorage.blob.core.windows.net/public/sai/bcmsai/$(LIBSAIBCM_BRANCH_NAME)/$(LIBSAIBCM_XGS_VERSION)"
 
 BRCM_SAI = libsaibcm_$(LIBSAIBCM_XGS_VERSION)_amd64.deb