Suggestion: Change height Parameter Type from int64 to uint64 in IUpgradeEntrypoint

[zsystm]

Description and context

In the current implementation of the UpgradeEntrypoint interface, the height parameter in both the SoftwareUpgrade event and the planUpgrade function is defined as an int64. I suggest changing this type to uint64 for the following reasons:

1. The block height is always non-negative, so int64 is unnecessary and could cause confusion.
2. The processing logic already treats any height less than or equal to zero as an error (ref. link).
3. Using uint64 makes the code clearer and safer by explicitly indicating that only non-negative values are allowed.

Suggested solution

Change int64 to uint64

Definition of done

• Update related Solidity codes.
• Deploy the new UpgradeEntrypoint