message: make `DB` `?Sized` on `execute_query_implementation` helper
diff: @@ -306,7 +306,7 @@ impl Runtime {
  execute: impl FnOnce() -> V,
  ) -> ComputedQueryResult<V>
  where
  - DB: Database,
  + DB: ?Sized + Database,
  {
  debug!(
  "{:?}: execute_query_implementation invoked",
  