Enable strict concurrency #22

Job	Run time
Soundness / API breakage check	39s
Soundness / Broken symlinks check	5s
Soundness / Format check	35s
Soundness / Documentation check	1m 2s
Soundness / License headers check	2s
Soundness / Shell check	36s
Soundness / Unacceptable language check	4s
Soundness / Python lint check	5s
Soundness / YAML lint check	5s
Cxx interop / Cxx interop / Linux (5.9)	45s
Cxx interop / Cxx interop / Windows (6.0)	2s
Cxx interop / Cxx interop / Linux (5.10)	42s
Cxx interop / Cxx interop / Linux (6.0)	51s
Cxx interop / Cxx interop / Linux (nightly-6.0)	50s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Linux (nightly-main)	55s
Cxx interop / Cxx interop / Windows (nightly-main)	3s
Unit tests / Unit tests / Linux (5.9)	35s
Unit tests / Unit tests / Linux (5.10)	39s
Unit tests / Unit tests / Linux (6.0)	49s
Unit tests / Unit tests / Windows (6.0)	8m 1s
Unit tests / Unit tests / Linux (nightly-6.0)	55s
Unit tests / Unit tests / Linux (nightly-main)	55s
Unit tests / Unit tests / Windows (nightly-6.0)	8m 0s
Unit tests / Unit tests / Windows (nightly-main)	8m 0s
	35m 17s

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