sql_ext: ignore another clippy warning

Summary: This code is only used to test that it compiles. We don't care about warnings or clippy lints, as demonstrated by the fact we already ignore many others.

Differential Revision: D51109786

fbshipit-source-id: a4c646760e61cf88290131658db2682ffdc082e5

eden/mononoke/common/rust/sql_ext/src/mononoke_queries.rs

@@ -491,7 +491,8 @@ mod tests {
         dead_code,
         unreachable_code,
         unused_variables,
-        clippy::diverging_sub_expression
+        clippy::diverging_sub_expression,
+        clippy::todo
     )]
     async fn should_compile() -> anyhow::Result<()> {
         use sql_query_config::SqlQueryConfig;