Fix new warnings #1097

Job	Run time
Construct integration test matrix	7s
Vsock tests	2m 2s
Benchmarks / Construct Benchmarks matrix	2s
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	2m 7s
Soundness / Documentation check	2m 15s
Soundness / Unacceptable language check	5s
Soundness / Broken symlinks check	5s
Soundness / License headers check	9s
Soundness / Format check	50s
Soundness / Python lint check	4s
Soundness / Shell check	43s
Soundness / YAML lint check	9s
Cxx interop / Cxx interop / Linux (5.9)	1m 17s
Cxx interop / Cxx interop / Linux (5.10)	1m 10s
Cxx interop / Cxx interop / Linux (6.0)	1m 22s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 41s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 38s
Benchmarks / Benchmarks / Linux (5.9)	5m 22s
Benchmarks / Benchmarks / Linux (5.10)	5m 2s
Benchmarks / Benchmarks / Linux (6.0)	5m 42s
Benchmarks / Benchmarks / Linux (nightly-6.0)	6m 14s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 32s
Unit tests / Unit tests / Linux (5.9)	3m 51s
Unit tests / Unit tests / Linux (5.10)	3m 46s
Unit tests / Unit tests / Linux (6.0)	4m 10s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 32s
Unit tests / Unit tests / Linux (nightly-main)	4m 31s
Integration tests / Linux (5.9)	15m 40s
Integration tests / Linux (5.10)	14m 11s
Integration tests / Linux (6.0)	16m 18s
Integration tests / Linux (nightly-6.0)	16m 26s
Integration tests / Linux (nightly-main)	17m 3s
	2h 23m 11s

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