Size of poem::Error exceeds clippy::result_large_err threshold

[leiysky]

error: the `Err`-variant returned from this function is very large
   --> crates/server/src/http/statements.rs:333:6
    |
333 | ) -> poem::Result<StatementResultSet> {
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 176 bytes
    |
    = help: try reducing the size of `poem::Error`, for example by boxing large elements or replacing it with `Box<poem::Error>`
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#result_large_err
    = note: `-D clippy::result-large-err` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::result_large_err)]`