Updated DNX chip bcmsai version 7.1.66.7 (#18671)

Add following fixes to the SAI

BRCM CSP # CS00012343052 - ESB_ECC_Ecc_2bErrInt seen in production
BRCM CSP # CS00012333604 - J2C+ internal thermal sensor(s) spiking high spontaneously, seemingly in error

platform/broadcom/sai.mk

@@ -1,5 +1,5 @@
 LIBSAIBCM_XGS_VERSION = 7.1.73.4
-LIBSAIBCM_DNX_VERSION = 7.1.66.6
+LIBSAIBCM_DNX_VERSION = 7.1.66.7
 LIBSAIBCM_BRANCH_NAME = REL_7.0_202205
 LIBSAIBCM_XGS_URL_PREFIX = "https://sonicstorage.blob.core.windows.net/public/sai/bcmsai/$(LIBSAIBCM_BRANCH_NAME)/$(LIBSAIBCM_XGS_VERSION)"
 LIBSAIBCM_DNX_URL_PREFIX = "https://sonicstorage.blob.core.windows.net/public/sai/bcmsai/$(LIBSAIBCM_BRANCH_NAME)/$(LIBSAIBCM_DNX_VERSION)"