Adopt Mutex where available #21

Job	Run time
Soundness / API breakage check	46s
Soundness / Documentation check	59s
Soundness / Broken symlinks check	5s
Soundness / Format check	37s
Soundness / License headers check	3s
Soundness / Python lint check	3s
Soundness / Shell check	35s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	4s
Benchmarks / Benchmarks / Linux (5.9)	2m 14s
Benchmarks / Benchmarks / Linux (5.10)	2m 17s
Benchmarks / Benchmarks / Windows (6.0)	1s
Benchmarks / Benchmarks / Linux (6.0)	2m 3s
Benchmarks / Benchmarks / Windows (nightly-6.0)	4s
Benchmarks / Benchmarks / Linux (nightly-6.0)	3m 4s
Benchmarks / Benchmarks / Windows (nightly-main)	3s
Cxx interop / Cxx interop / Linux (5.9)	44s
Cxx interop / Cxx interop / Windows (6.0)	1s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 46s
Cxx interop / Cxx interop / Linux (5.10)	50s
Cxx interop / Cxx interop / Linux (6.0)	52s
Cxx interop / Cxx interop / Windows (nightly-6.0)	1s
Cxx interop / Cxx interop / Linux (nightly-6.0)	58s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 5s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (5.9)	37s
Unit tests / Unit tests / Linux (5.10)	40s
Unit tests / Unit tests / Linux (6.0)	52s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 2s
Unit tests / Unit tests / Linux (nightly-main)	57s
Unit tests / Unit tests / Windows (6.0)	5m 35s
Unit tests / Unit tests / Windows (nightly-6.0)	5m 33s
Unit tests / Unit tests / Windows (nightly-main)	5m 31s
	41m 6s

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