release v3.9.0
[v3.9.0](https://github.com/team-alembic/ash_authentication/compare/v3.8.0...v3.9.0) (2023-02-09)
Features:
* Add new "magic link" authentication strategy. (#184)
Bug Fixes:
* validate uniqueness of strategy names. (#185)
* resources can appear in multiple apis, so we need to uniq them here (#169)
* put_add_on/2 was putting into strategies
Improvements:
* Strategy.Custom: handle custom strategies as extensions. (#183)
* improve error message for badly formed token secrets (#181)
* add metadata declarations to actions that have a `token` (#164)
* validate signing secret is a string (#163)
