Missing Sendable conformance on core types for Swift 6 Strict Concurrency

[shrudge]

SerpApiClient is defined as a class with a mutable params dictionary. Without explicit Sendable conformance or internal synchronization, this type cannot be safely passed across actor boundaries under Swift 6 strict concurrency rules.

[report-tracking-bot]

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[roi-serpapi]

Thanks for raising a ticket @shrudge!