update-checkout-config.json: bump SwiftNIO to 2.92.2 (#86460)
This version bump is required to update WasmKit to 0.2.0 in a separate PR (https://github.com/swiftlang/swift/pull/86440), which itself is required to enable Wasm debugging tests in LLDB.
The version bump is not planned for 6.3, as Swift bootstrapping version for `release/6.3` CI jobs is too low: 5.9 as opposed to newly required Swift 6.0 in latest SwiftNIO and WasmKit versions.
