Fix a few simple sendability issues #116

Job	Run time
Cxx interop / Construct Cxx interop matrix	7s
Unit tests / Construct unit test matrix	5s
Soundness / API breakage check	58s
Soundness / Documentation check	54s
Soundness / License headers check	7s
Soundness / Unacceptable language check	4s
Soundness / Broken symlinks check	7s
Soundness / Format check	37s
Soundness / Shell check	31s
Soundness / Python lint check	5s
Soundness / YAML lint check	6s
Static SDK / Static SDK / Linux (latest-release Jammy)	2m 14s
Static SDK / Static SDK / Linux (main Jammy)	2m 3s
Unit tests / Unit tests / Linux (5.10)	1m 15s
Unit tests / Unit tests / Linux (6.0)	1m 14s
Unit tests / Unit tests / Linux (6.1)	34s
Unit tests / Unit tests / Linux (nightly-next)	1m 56s
Unit tests / Unit tests / Linux (nightly-main)	1m 14s
Cxx interop / Cxx interop / Linux (5.10)	1m 4s
Cxx interop / Cxx interop / Linux (6.0)	1m 4s
Cxx interop / Cxx interop / Linux (6.1)	32s
Cxx interop / Cxx interop / Linux (nightly-next)	1m 4s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 5s
	19m 0s

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