update cardinal version (zilliztech#1405)

Signed-off-by: xianliang.li <xianliang.li@zilliz.com>

Author: foxspy

cmake/libs/cardinal/v2/CMakeLists.txt

@@ -3,7 +3,7 @@ project(knowhere CXX C)
 
 # Use short SHA1 as version
 # v2.6 tag is used for cardinal v2
-set(CARDINAL_VERSION v2.6.5)
+set(CARDINAL_VERSION v2.6.6)
 set(CARDINAL_REPO_URL "https://github.com/zilliztech/cardinal.git")
 
 set(CARDINAL_ROOT  "${KNOWHERE_THRID_ROOT}/cardinalv2")