Make the ResponseAccumulator Sendable #132

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	8s
Soundness / API breakage check	4m 23s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	2m 49s
Soundness / Format check	37s
Soundness / License headers check	5s
Soundness / Unacceptable language check	8s
Soundness / Python lint check	6s
Soundness / Shell check	34s
Soundness / YAML lint check	4s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 26s
Static SDK / Static SDK / Linux (main Jammy)	2m 7s
Cxx interop / Cxx interop / Linux (5.10)	2m 37s
Cxx interop / Cxx interop / Linux (6.0)	2m 47s
Cxx interop / Cxx interop / Linux (6.1)	2m 55s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 27s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 36s
Unit tests / Unit tests / Linux (5.10)	4m 42s
Unit tests / Unit tests / Linux (6.0)	5m 11s
Unit tests / Unit tests / Linux (6.1)	5m 9s
Unit tests / Unit tests / Linux (nightly-next)	5m 51s
Unit tests / Unit tests / Linux (nightly-main)	5m 55s
	56m 42s

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