chore(stm): add 'strum' dependency

Author: jpraynaud

Cargo.lock

@@ -27,6 +27,7 @@ digest = { workspace = true }
 rand_core = { workspace = true }
 rayon = { workspace = true }
 serde = { workspace = true }
+strum.workspace = true
 thiserror = { workspace = true }
 
 [target.'cfg(any(target_family = "wasm", windows))'.dependencies]