Fix undefined macro warn! on 32-bit

       Compiling garage_db v0.8.2 (garage-0.8.2/src/db)
    error: cannot find macro `warn` in this scope
       --> src/db/lmdb_adapter.rs:352:2
        |
    352 |     warn!("LMDB is not recommended on 32-bit systems, database size will be limited");
        |     ^^^^
        |
        = help: consider importing this macro:
                tracing::warn
        = note: `warn` is in scope, but it is an attribute: `#[warn]`
    error: could not compile `garage_db` due to previous error

0 files changed, 0 insertions, 0 deletions