Implement upgrade_contract auth

[Akshola00]

Description

Ensure only the admin can call upgrade.

Testing Requirements

Auth test.

• Crucial: Ensure all standard GitHub CI checks pass before submitting your PR!

Links

• See contributor.md for guidelines.

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[Pvsaint]

@Pvsaint has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi, I'm Victor, a software developer, proficient in rust, nextjs, react, typescript, etc.
I'd love to contribute to this project by taking this issue if it's available, ETA 24hrs.

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Congratulations, @Pvsaint! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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