Enable strict concurrency #41

Job	Run time
Unit tests / Unit tests (swift:5.9-jammy, 5.9, true)	4m 31s
Unit tests / Unit tests (swift:5.10-jammy, 5.10, true)	4m 42s
Unit tests / Unit tests (swift:6.0-jammy, 6.0, true)	4m 34s
Unit tests / Unit tests (swiftlang/swift:nightly-6.0-jammy, nightly-6.0, true)	3m 54s
Unit tests / Unit tests (swiftlang/swift:nightly-main-jammy, nightly-main, true)	5m 26s
Cxx interop / Windows (nightly-6.0)	1s
Cxx interop / Windows (6.0)	2s
Cxx interop / Windows (nightly-main)	3s
Cxx interop / Linux (5.9)	2m 10s
Cxx interop / Linux (5.10)	2m 13s
Soundness / Unacceptable language check	8s
Cxx interop / Linux (6.0)	2m 15s
Cxx interop / Linux (nightly-6.0)	2m 49s
Cxx interop / Linux (nightly-main)	2m 56s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	7s
Soundness / Documentation check	0s
Soundness / License headers check	6s
Soundness / Format check	38s
Soundness / Shell check	34s
Soundness / Python lint check	8s
Soundness / YAML lint check	5s
	37m 22s

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