Update supported version in SECURITY.md to 0.3.x

[peteski22]

Summary

• Updates the supported version in SECURITY.md from 0.0.x to 0.3.x to reflect the latest release (v0.3.0)
• Marks versions older than 0.3 as unsupported

Test plan

• Verified latest release is v0.3.0
• Review the SECURITY.md change

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/security-supported-version

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