Enable StrictConcurrency checking #1225

Job	Run time
macos-all (postgresql@16, scram-sha-256, ~14.3)	5m 53s
api-breakage	4m 40s
linux-unit (swift:5.8-jammy)	2m 37s
macos-all (postgresql@16, scram-sha-256, ~15)	2m 1s
linux-integration-and-dependencies (postgres:16)	9m 19s
linux-unit (swift:5.9-jammy)	2m 51s
linux-integration-and-dependencies (postgres:14)	8m 59s
linux-unit (swift:5.10-noble)	3m 27s
linux-integration-and-dependencies (postgres:12)	9m 11s
linux-unit (swiftlang/swift:nightly-6.0-jammy)	3m 47s
linux-unit (swiftlang/swift:nightly-main-jammy)	3m 46s
	56m 31s

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