fix: add actions:read permission for OSV-Scanner

[magnonta]

The OSV-Scanner reusable workflow needs actions: read permission. Added to the top-level permissions block.

[github-advanced-security]

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[Copilot]

Pull request overview

Adds the missing actions: read permission to the repository’s security scanning workflow so the OSV-Scanner reusable workflow can run with the required token scope.

Changes:

• Update .github/workflows/security.yml top-level permissions to include actions: read.

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