Enable strict concurrency #4

Job	Run time
Soundness / Documentation check	1m 22s
Soundness / Format check	33s
Soundness / Broken symlinks check	3s
Soundness / API breakage check	1m 32s
Soundness / License headers check	4s
Soundness / Python lint check	3s
Soundness / Shell check	30s
Soundness / Unacceptable language check	4s
Soundness / YAML lint check	2s
Cxx interop / Cxx interop / Windows (6.0)	1s
Cxx interop / Cxx interop / Linux (5.9)	1m 12s
Cxx interop / Cxx interop / Linux (5.10)	1m 4s
Cxx interop / Cxx interop / Linux (6.0)	1m 20s
Cxx interop / Cxx interop / Windows (nightly-6.0)	1s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 28s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 29s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Linux (5.9)	1m 3s
Unit tests / Unit tests / Linux (5.10)	1m 0s
Unit tests / Unit tests / Linux (6.0)	1m 10s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 25s
Unit tests / Unit tests / Windows (nightly-main)	3s
Unit tests / Unit tests / Linux (nightly-main)	1m 23s
	16m 57s

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