chore: release v2.1.2

[github-actions[bot]]

🤖 New release

• bon: 2.1.1 -> 2.1.2
• bon-macros: 2.1.1 -> 2.1.2

Changelog

## `bon`

## [2.1.2](https://github.com/elastio/bon/compare/v2.1.1...v2.1.2) - 2024-09-08 ### Other - Add `#[builder(derive(...))]` ([#113](https://github.com/elastio/bon/pull/113)) - Fix code generation for structs with default values for generic parameters ([#108](https://github.com/elastio/bon/pull/108)) - `#[derive(bon::Builder)]` and support for `cfg/cfg_attr` ([#99](https://github.com/elastio/bon/pull/99)) ### Fixed - Fixed a bug where a member of opaque `Option` type (i.e. the `Option` type was renamed to make the builder macro not detect it as `Option`) was still optional.

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