chore: bump savvy from 0.3.0 to 0.4.0 in /src/rust

[dependabot]

Bumps savvy from 0.3.0 to 0.4.0.

Changelog

Sourced from savvy's changelog.

[v0.4.0] (2024-03-27)

Breaking changes

• #[savvy] on a struct's impl now generates the same name of R object that holds all the accociated functions. For example, previously the below code generates a constructor Person(), but now the constructor is available as Person$new().

struct Person {
    pub name: String,
}
/// @​export
#[savvy]
impl Person {
fn new() -> Self {
Self {
name: "".to_string(),
}
}
}

New Features

• A struct marked with #[savvy] can be used as the return type of the associated function. In conjunction with the change in v0.3.0, now a user-defined struct can be used more flexibly than before. Please refer to the "Struct" section of the guide
• An experimental support on complex is added under compex feature flag. ComplexSexp and OwnedComplexSexp are the corresponding Rust types.
• OwnedIntegerSexp and etc now have set_na(i) method for shorthand of set_elt(i, T::na()). This is particularly useful for OwnedLogicalSexp because its setter interface set_elt() only accepts bool and no missing values.

Fixed bugs

• An expert-only method new_without_init() now skips initialization as intended.

Commits

• b4159e9 chore: Release
• 0f5eef1 Fix
• 68755e9 Use set_na() in examples
• 0f75024 Support complex (#122)
• aa1ae87 Fix new_without_init() (#121)
• 19deecd Update documents and add changelog for #117 (#120)
• 7064b4c Add set_na() (#119)
• f94e3ae Support specifying a user-defined struct as return type (#117)
• See full diff in compare view

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[eitsupi]

The CI failure seems unrelated to this change.