backend/v1.5.1

This release introduces more changes to the way the login flow reacts to the new privacy settings.

If  `onlyShowActualLoginMethods` is enabled:
- Existing passkeys also show up as an option in login method chooser that is displayed after a user enters their email address or username in the login form
- If a passkey is the only available option for a user, the device's passkey UI flow is automatically triggered
- In contrast to the “Sign in with a passkey” button on the main login page, where all passkeys available on the device are displayed, the passkey selection triggered from the login method chooser is limited to the passkeys assigned to the user for whom the email address or user name was entered in the first step

## What's Changed
* fix: migration issues by @lfleischmann in https://github.com/teamhanko/hanko/pull/2084
* feat: add passkey option to login method chooser by @FreddyDevelop in https://github.com/teamhanko/hanko/pull/2100
* chore: update versions to 1.5.1 by @FreddyDevelop in https://github.com/teamhanko/hanko/pull/2104


**Full Changelog**: https://github.com/teamhanko/hanko/compare/backend/v1.5.0...backend/v1.5.1