SwiftNIO 2.42.0

Security

• This update fixes CVE-2022-3215: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') . For more details please see the security advisory. Please update to 2.42.0 as rapidly as possible.

SemVer Minor

• Implement a back-pressure aware AsyncSequence source (#2230)
• Add throwing version of NIOAsyncSequenceProducer (#2237)
• Conform NIOTooManyBytesError to Hashable (#2246)
• Functions passed to non-Sendable ChannelHandlers do not need to conform to Sendable (#2249)
• Implement a NIOAsyncWriter (#2251)
• Add EventLoopFuture.makeCompletedFuture(withResultOf:) (#2253)
• HTTPResponseStatus should print code and reason (#2257)
• Provide NIOAsyncTestingChannel (#2238)
• NIOConcurrency: add NIOLockedValueBox (#2265)
• rename class Lock to struct NIOLock (#2266)

SemVer Patch

• Small changes for the NIOAsyncSequenceProducer (#2254)
• Call finish once the Source is deinited (#2258)
• Add availability requirements to NIOAsyncSequenceProducer extension (#2236)
• Update HTTP parser to LLHTTP (#2263)
• Add support for newer LLHTTP status codes (#2269)

Other Changes

• Define Array element type explicitly to fix nightly CI (#2250)
• Fix typo in the name of a constant (#2262, patch credit to @heldersrvio)
• Fixup docs for the NIOAsyncWriter (#2271)
• initial adoption of DocC based documentaiton (#2235)
• Update soundness.sh (#2240)
• Validate missing imports in CI (#2245)
• Widen the tolerance on testSystemCallWrapperPerformance in debug mode (#2259)
• helpful error message when compiling without test discovery on >= 5.5 (#2264)
• address additional NIOLockedValueBox review comments (#2270)