Merge pull request #3025 from liyun95/v2.4.x

update variables

Author: liyun95

site/en/Variables.json

@@ -4,7 +4,7 @@
   "milvus_deb_name": "milvus_2.2.0-1_amd64",
   "milvus_rpm_name": "milvus-2.2.0-1.el7.x86_64",
   "milvus_python_sdk_version": "2.4.x",
-  "milvus_python_sdk_real_version": "2.4.14",
+  "milvus_python_sdk_real_version": "2.4.15",
   "milvus_node_sdk_version": "2.4.x",
   "milvus_node_sdk_real_version": "v2.4.11",
   "milvus_go_sdk_version": "2.3.x",