Release 0.78.1

What's Changed

Fixes

• Enable test data generation without mock verkkokauppa enabled by @matti-lamppu in #1444
• Fix not allowing blank details on mass reservation cancel and deny endpoints by @matti-lamppu in #1445
• Fix anonymize_old_users_task task name by @matti-lamppu in #1447

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Full Changelog: v0.78.0...v0.78.1