[202311] Upgrade xgs SAI version to 10.1.20.0 (#19322)

* Upgrade xgs SAI version to 10.1.21.0

Signed-off-by: zitingguo-ms <zitingguo@microsoft.com>

* upgrade xgs SAI version to 10.1.20.0

Signed-off-by: zitingguo-ms <zitingguo@microsoft.com>

* change xgs branch name

Signed-off-by: zitingguo-ms <zitingguo@microsoft.com>

---------

Signed-off-by: zitingguo-ms <zitingguo@microsoft.com>

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 = 7.1.111.1
-LIBSAIBCM_XGS_BRANCH_NAME = SAI_10.1.0_GA
+LIBSAIBCM_XGS_BRANCH_NAME = SAI_10.1.20.0
 LIBSAIBCM_DNX_BRANCH_NAME = REL_7.0_SAI_1.11
 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/bcmsai/$(LIBSAIBCM_DNX_BRANCH_NAME)/$(LIBSAIBCM_DNX_VERSION)"