Enable strict concurrency #10

Job	Run time
Soundness / Broken symlinks check	5s
Soundness / API breakage check	44s
Soundness / Documentation check	1m 3s
Soundness / Format check	36s
Soundness / License headers check	3s
Soundness / Unacceptable language check	3s
Soundness / Python lint check	5s
Soundness / Shell check	37s
Soundness / YAML lint check	5s
Cxx interop / Cxx interop / Windows (6.0)	3s
Cxx interop / Cxx interop / Windows (nightly-6.0)	3s
Cxx interop / Cxx interop / Linux (5.9)	43s
Cxx interop / Cxx interop / Windows (nightly-main)	3s
Cxx interop / Cxx interop / Linux (5.10)	42s
Cxx interop / Cxx interop / Linux (6.0)	51s
Cxx interop / Cxx interop / Linux (nightly-6.0)	55s
Cxx interop / Cxx interop / Linux (nightly-main)	56s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Linux (5.9)	43s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Linux (5.10)	43s
Unit tests / Unit tests / Linux (6.0)	50s
Unit tests / Unit tests / Windows (nightly-main)	3s
Unit tests / Unit tests / Linux (nightly-6.0)	52s
Unit tests / Unit tests / Linux (nightly-main)	55s
	11m 47s

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