Use default-features, not default_features

[waywardmonkeys]

The latter syntax is deprecated and will be removed in Rust 2024 edition. This also generates a warning with current versions of Rust.

• Tested on all platforms changed
• Added an entry to the changelog module if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created or updated an example program if it would help users understand this functionality
• Updated feature matrix, if new features were added or implemented

[madsmtm]

Thanks!