Fix a few simple sendability issues #117

Job	Run time
Cxx interop / Construct Cxx interop matrix	7s
Unit tests / Construct unit test matrix	7s
Soundness / API breakage check	4m 21s
Soundness / Documentation check	3m 1s
Soundness / Broken symlinks check	6s
Soundness / License headers check	11s
Soundness / Unacceptable language check	7s
Soundness / Format check	38s
Soundness / Python lint check	12s
Soundness / Shell check	37s
Soundness / YAML lint check	7s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 47s
Static SDK / Static SDK / Linux (main Jammy)	2m 2s
Cxx interop / Cxx interop / Linux (5.10)	2m 39s
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 36s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 35s
Unit tests / Unit tests / Linux (5.10)	4m 52s
Unit tests / Unit tests / Linux (6.0)	5m 17s
Unit tests / Unit tests / Linux (6.1)	5m 5s
Unit tests / Unit tests / Linux (nightly-next)	5m 56s
Unit tests / Unit tests / Linux (nightly-main)	5m 53s
	57m 58s

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