Release v1.5.3

Automated release for version v1.5.3.

Changes in this release:
chore: update repository references for migration to ScannerAndroid
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Updated UpdateManager GitHub API endpoint to point to the new repository name.
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Updated the GitHub source code link in the Settings screen.
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Changed the update download notification title for consistency with the new naming.
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Kept all internal app branding as "DAF Scanner" to maintain consistency for existing users.