Error return value of `k.lastestAuctionPeriod.Set` is not checked (errcheck)

Error return value of `k.refundBidders` is not checked (errcheck)

const `listSeparator` is unused (unused)

SA1019: sdk.LengthPrefixedAddressKey is deprecated: LengthPrefixedAddressKey implements an SDK backwards compatible indexing key encoder for addresses. The status quo in the SDK is that address keys are length prefixed even when they're the last part of a composite key. This should never be used unless to retain state compatibility. For example, a composite key composed of `[string, address]` in theory would need you only to define a way to understand when the string part finishes, we usually do this by appending a null byte to the string, then when you know when the string part finishes, it's logical that the part which remains is the address key. In the SDK instead we prepend to the address key its length too. (staticcheck)

issues found

The following actions use a deprecated Node.js version and will be forced to run on node20: golangci/[email protected]. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/