warning: struct `LspsBuyJitChannelResponse` is never constructed

v26.06
Build on Debian 12.
`RUST_PROFILE=release uv run make`

```
---
cargo build --profile=release --locked --quiet --example cln-rpc-getinfo
cargo build --profile=release --locked --quiet --example cln-plugin-startup
cargo build --profile=release --locked --quiet --example cln-plugin-reentrant
cargo build --profile=release --locked --quiet --example cln-subscribe-wildcard
cargo build --profile=release --locked --quiet --bin cln-grpc
cargo build --profile=release --locked --quiet --bin clnrest
cargo build --profile=release --locked --quiet --bin cln-lsps-client
warning: struct `LspsBuyJitChannelResponse` is never constructed
--> plugins/lsps-plugin/src/client.rs:861:8
|
861 | struct LspsBuyJitChannelResponse {
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
---
```
rustc --version
rustc 1.95.0 (59807616e 2026-04-14)

cargo --version
cargo 1.95.0 (f2d3ce0bd 2026-03-21)