Upcoming changes in Seastar cause `rest::simple_send` to move the `http::request` into `seastar::http::experimental::client::make_request` when called multiple times. This leaves the original request in an invalid state. Specifically, the `_version` field becomes empty, causing request validation to fail. This patch ensures `version` is explicitly set to prevent such failures. Fixes: https://github.com/scylladb/scylladb/issues/26018 Closes scylladb/scylladb#26066