Fix warnings #56

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	2s
Soundness / API breakage check	2m 13s
Soundness / Documentation check	2m 6s
Soundness / Unacceptable language check	4s
Soundness / Broken symlinks check	3s
Soundness / License headers check	5s
Soundness / Format check	32s
Soundness / Python lint check	4s
Soundness / Shell check	36s
Soundness / YAML lint check	2s
Unit tests / Unit tests / Linux (5.9)	2m 41s
Unit tests / Unit tests / Linux (5.10)	2m 42s
Cxx interop / Cxx interop / Linux (5.9)	1m 26s
Unit tests / Unit tests / Linux (6.0)	3m 1s
Cxx interop / Cxx interop / Linux (5.10)	1m 23s
Unit tests / Unit tests / Linux (nightly-6.0)	3m 14s
Cxx interop / Cxx interop / Linux (6.0)	1m 32s
Unit tests / Unit tests / Linux (nightly-main)	2m 57s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 47s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 49s
	28m 21s

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