Update version (#1186)

Author: jonsimantov

cpp_sdk_version.json

@@ -1,5 +1,5 @@
 {
-  "released": "10.3.0",
-  "stable": "10.3.0",
-  "head": "10.3.0"
+  "released": "10.4.0",
+  "stable": "10.4.0",
+  "head": "10.4.0"
 }