Typo error `stingSliceResults` in store_valkey.go

Task description:
typo error in store_valkey.go
https://github.com/volcano-sh/agentcube/blob/ced2f28e2279d352155f93af42cdb5ff45d19a69/pkg/store/store_valkey.go#L114

Solution:

stingSliceResults should be stringSliceResults

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