upgrade xgs SAI to 10.1.20.0 (#19462)

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

Author: Gfrom2016

platform/broadcom/sai.mk

@@ -1,6 +1,6 @@
-LIBSAIBCM_XGS_VERSION = 10.1.7.0
+LIBSAIBCM_XGS_VERSION = 10.1.20.0
 LIBSAIBCM_DNX_VERSION = 10.1.21.0
-LIBSAIBCM_XGS_BRANCH_NAME = SAI_10.1.0_GA
+LIBSAIBCM_XGS_BRANCH_NAME = SAI_10.1.20.0
 LIBSAIBCM_DNX_BRANCH_NAME = SAI_10.1.21.1
 LIBSAIBCM_XGS_URL_PREFIX = "https://sonicstorage.blob.core.windows.net/public/sai/sai-broadcom/$(LIBSAIBCM_XGS_BRANCH_NAME)/$(LIBSAIBCM_XGS_VERSION)/xgs"
 LIBSAIBCM_DNX_URL_PREFIX = "https://sonicstorage.blob.core.windows.net/public/sai/sai-broadcom/$(LIBSAIBCM_DNX_BRANCH_NAME)/$(LIBSAIBCM_DNX_VERSION)/dnx"