fix unneeded pub(crate)

Author: mskrzypkows

crates/core/src/dutydb/memory.rs

@@ -659,7 +659,7 @@ impl State {
 }
 
 #[cfg(test)]
-pub(crate) mod tests {
+mod tests {
     use std::sync::Arc;
 
     use async_trait::async_trait;