!12859 update the md5 of pybind11-2.6.1 for python3.8

From: @yepei6
Reviewed-by: @kingxian,@kisnwang
Signed-off-by: @kingxian

cmake/external_libs/pybind11.cmake

@@ -3,7 +3,7 @@ set(PYTHON_VERSION ${Python3_VERSION_MAJOR}.${Python3_VERSION_MINOR})
 if(ENABLE_GITEE)
     if(PYTHON_VERSION MATCHES "3.8")
         set(REQ_URL "https://gitee.com/mirrors/pybind11/repository/archive/v2.6.1.tar.gz")
-        set(MD5 "dcbb02cc2da9653ec91860bb0594c91d")
+        set(MD5 "a9b7642031f35daf33a75fe837b3dd31")
     elseif(PYTHON_VERSION MATCHES "3.7")
         set(REQ_URL "https://gitee.com/mirrors/pybind11/repository/archive/v2.4.3.tar.gz")
         set(MD5 "b473a37987ce456ea8cc7aab3f9486f9")