fix: problem of feature configuration (#210)

The usage of the serde feature activated the rhai feature, despite
 the fact that it was disabled

engine/translator/Cargo.toml

@@ -17,7 +17,7 @@ default = ["rhai", "strsim"]
 rhai = ["dep:rhai"]
 rhai-wasm = ["rhai", "rhai/wasm-bindgen"]
 strsim = ["dep:strsim"]
-serde = ["indexmap/serde", "rhai/serde"]
+serde = ["indexmap/serde", "rhai?/serde"]
 
 [dependencies]
 rhai = { version = "1.17.1", optional = true, features = ["only_i32", "no_float", "no_closure", "unchecked", "no_position", "no_custom_syntax"] }