Adopt Mutex where available #23

Job	Run time
Soundness / API breakage check	49s
Soundness / Documentation check	1m 5s
Soundness / Broken symlinks check	3s
Soundness / Format check	38s
Soundness / License headers check	3s
Soundness / Python lint check	7s
Soundness / Shell check	35s
Soundness / Unacceptable language check	5s
Soundness / YAML lint check	4s
Benchmarks / Benchmarks / Linux (5.9)	2m 18s
Benchmarks / Benchmarks / Linux (5.10)	2m 11s
Benchmarks / Benchmarks / Linux (6.0)	2m 24s
Benchmarks / Benchmarks / Linux (nightly-6.0)	3m 6s
Benchmarks / Benchmarks / Windows (6.0)	2s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 50s
Cxx interop / Cxx interop / Windows (6.0)	2s
Cxx interop / Cxx interop / Linux (5.9)	47s
Benchmarks / Benchmarks / Windows (nightly-6.0)	1s
Cxx interop / Cxx interop / Linux (5.10)	49s
Cxx interop / Cxx interop / Windows (nightly-6.0)	4s
Benchmarks / Benchmarks / Windows (nightly-main)	4s
Cxx interop / Cxx interop / Linux (6.0)	53s
Cxx interop / Cxx interop / Windows (nightly-main)	3s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 2s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 3s
Unit tests / Unit tests / Linux (5.9)	44s
Unit tests / Unit tests / Windows (6.0)	14m 10s
Unit tests / Unit tests / Linux (5.10)	34s
Unit tests / Unit tests / Linux (6.0)	54s
Unit tests / Unit tests / Windows (nightly-6.0)	13m 25s
Unit tests / Unit tests / Linux (nightly-6.0)	56s
Unit tests / Unit tests / Windows (nightly-main)	13m 52s
Unit tests / Unit tests / Linux (nightly-main)	57s
	1h 6m 40s

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