SC-21: Implement upgradeability pattern for game_contract

[chinweobtagaz]

Context: If a critical bug is discovered in production, deploying a completely new contract breaks state continuity (active escrows, balances). There is currently no way to seamlessly patch the contract.
Location: contracts/game_contract/src/lib.rs
Acceptance Criteria:

• Implement Soroban's native contract upgrade functionality via env.deployer().update_current_contract_wasm() restricted to ADMIN_KEY.

[Stephan-Thomas]

@Stephan-Thomas has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

hi, i would like to work on this.

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[NEA-DEV-coder]

@NEA-DEV-coder has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer, I would like to work on this issue

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[zeey-247]

@zeey-247 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello, I’m interested in this issue. Please assign it to me. Thank you.

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[GOE001]

@GOE001 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to on work on this

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