Enable strict concurrency #17

Job	Run time
Soundness / API breakage check	45s
Soundness / Broken symlinks check	4s
Soundness / Documentation check	1m 3s
Soundness / Format check	36s
Soundness / License headers check	6s
Soundness / Unacceptable language check	2s
Soundness / Shell check	37s
Soundness / Python lint check	7s
Soundness / YAML lint check	3s
Benchmarks / Benchmarks / Linux (5.9)	2m 18s
Benchmarks / Benchmarks / Linux (5.10)	2m 8s
Benchmarks / Benchmarks / Linux (6.0)	2m 26s
Benchmarks / Benchmarks / Linux (nightly-6.0)	3m 7s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 39s
Benchmarks / Benchmarks / Windows (6.0)	1s
Benchmarks / Benchmarks / Windows (nightly-6.0)	1s
Cxx interop / Cxx interop / Linux (5.9)	49s
Benchmarks / Benchmarks / Windows (nightly-main)	1s
Cxx interop / Cxx interop / Windows (6.0)	3s
Cxx interop / Cxx interop / Linux (5.10)	48s
Cxx interop / Cxx interop / Linux (6.0)	47s
Cxx interop / Cxx interop / Linux (nightly-6.0)	55s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 6s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Windows (nightly-main)	2s
Unit tests / Unit tests / Linux (5.9)	42s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Linux (5.10)	45s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Linux (6.0)	49s
Unit tests / Unit tests / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (nightly-6.0)	54s
Unit tests / Unit tests / Linux (nightly-main)	53s
	24m 46s

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