Replace updateOrCreate with firstOrCreate in AnnouncementsDatabaseSeeder

[roble]

This pull request makes a minor change to the AnnouncementsDatabaseSeeder class to improve how the initial announcement record is seeded in the database. The update replaces the updateOrCreate method with firstOrCreate, which ensures the announcement is only created if it doesn't already exist, without updating existing records.

[Copilot]

Pull request overview

This PR adjusts the announcements module’s database seeding behavior so the initial “module is live” banner is created only when missing, and existing announcements are not modified during seeding.

Changes:

• Replace Announcement::updateOrCreate(...) with Announcement::firstOrCreate(...) in the announcements seeder to avoid updating existing rows.

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