Fix compilation error with `fluent-syntax` span PR
Dependencies
- [2]
3NMKD6I5Refactor `Localize` trait to use `std::io::Write` - [3]
QFPQZR4KRefactor `fluent_embed` - [*]
5TEX4MNUSplit `fluent_embed` into `group` and `parse` modules
Change contents
- replacement in fluent_embed_derive/src/fluent/ast.rs at line 34
VariantKey::Identifier { name } => {VariantKey::Identifier { name, span: _ } => {