Fix incorrect return type in TicketPriceDomainObject

[yonix06]

Thank you for creating a PR! We appreciate your contribution to Hi.Events.

To make the process as smooth as possible, please ensure you've read the contributing guidelines before proceeding.

Please include a summary of the changes and the issue being fixed or the feature being added. The more detail, the better!

Checklist

• I have read the contributing guidelines.
• My code is of good quality and follows the coding standards of the project.
• I have tested my changes, and they work as expected.

Thank you for your contribution! 🎉

[trunk-io]

⏱️ 49s total CI duration on this PR

Job	Cumulative Duration	Recent Runs
run-tests (8.3)	23s	🟩
run-tests (8.2)	22s	🟩
CLAAssistant	4s	🟥

_{settings ⋅ feedback ⋅ docs ⋅ learn more about trunk.io}

[trunk-io]

Merging to develop in this repository is managed by Trunk.

• To merge this pull request, check the box to the left or comment /trunk merge below.

[yonix06]

.