This fixes the web release edit flow so renamed release attachments are
validated against `[repository.release] ALLOWED_TYPES`.
Previously, the API attachment edit endpoint already enforced release
attachment type restrictions, but the web release edit form passed
`attachment-edit-*` values into `release_service.UpdateRelease`, which
updated attachment names directly without validating the new filename
against `setting.Repository.Release.AllowedTypes`.
As a result, a user with repository write access could rename an
existing release attachment to a disallowed extension through the web
UI.
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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
e4ef995f2a