build(personfit): restore canonical crate manifest

Author: seonghobae

crates/mlsirm-core/Cargo.toml

@@ -36,4 +36,4 @@ unexpected_cfgs = { level = "warn", check-cfg = ["cfg(coverage)"] }
 
 [dev-dependencies]
 # proptest is dual MIT / Apache-2.0 licensed -- permissive, matches this crate.
-proptest = "1"
+proptest = "1"