chore: bump rust

and fix new lints that come with it

src/database/abstraction/watchers.rs

@@ -20,7 +20,7 @@ impl Watchers {
         let mut rx = match self.watchers.write().unwrap().entry(prefix.to_vec()) {
             hash_map::Entry::Occupied(o) => o.get().1.clone(),
             hash_map::Entry::Vacant(v) => {
-                let (tx, rx) = tokio::sync::watch::channel(());
+                let (tx, rx) = watch::channel(());
                 v.insert((tx, rx.clone()));
                 rx
             }