fix(db): convert SponsorBadgeScan.Notes to utf8mb4

[smarcet]

ref: https://app.clickup.com/t/86b9nvmdj
The Notes column is on utf8 (3-byte), causing 'Incorrect string value' PDOExceptions when users submit 4-byte characters (emoji, supplementary plane). Convert to utf8mb4_general_ci to match the precedent set for SummitAttendee.AdminNotes in Version20221012133111.

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➡️ https://OpenStackweb.github.io/summit-api/openapi/pr-536/

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