chore(all): bump milli

* updates to Use the milli's heed dependency #2210

* Update index.rs

* Update store.rs

* Update mod.rs

* cargo fmt

meilisearch-http/src/helpers/env.rs

@@ -4,7 +4,7 @@ pub trait EnvSizer {
     fn size(&self) -> u64;
 }
 
-impl EnvSizer for heed::Env {
+impl EnvSizer for milli::heed::Env {
     fn size(&self) -> u64 {
         WalkDir::new(self.path())
             .into_iter()