Enable strict concurrency #24

Job	Run time
Unit tests / Unit tests / Linux (5.9)	40s
Unit tests / Unit tests / Linux (5.10)	40s
Unit tests / Unit tests / Linux (6.0)	50s
Unit tests / Unit tests / Linux (nightly-6.0)	53s
Unit tests / Unit tests / Linux (nightly-main)	55s
Unit tests / Unit tests / Windows (6.0)	13m 1s
Unit tests / Unit tests / Windows (nightly-6.0)	14m 9s
Unit tests / Unit tests / Windows (nightly-main)	14m 24s
Soundness / API breakage check	39s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	59s
Soundness / License headers check	2s
Soundness / Format check	36s
Soundness / Unacceptable language check	4s
Soundness / Python lint check	5s
Soundness / Shell check	32s
Soundness / YAML lint check	2s
Cxx interop / Cxx interop / Linux (5.9)	43s
Cxx interop / Cxx interop / Windows (nightly-6.0)	1s
Cxx interop / Cxx interop / Linux (5.10)	45s
Cxx interop / Cxx interop / Windows (nightly-main)	2s
Cxx interop / Cxx interop / Linux (6.0)	49s
Cxx interop / Cxx interop / Linux (nightly-6.0)	53s
Cxx interop / Cxx interop / Linux (nightly-main)	51s
Cxx interop / Cxx interop / Windows (6.0)	3s
	52m 40s

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