test

Bump Swift minimum to 6.0 #242

Job	Run time
linux-all (postgres:13, postgres:14, trust, swift:6.0-noble)	5m 18s
api-breakage	7m 54s
macos-all (macos-15, latest-stable)	5m 11s
linux-all (postgres:17, postgres:18, scram-sha-256, swift:6.2-noble)	4m 59s
linux-all (postgres:15, postgres:16, md5, swift:6.1-noble)	5m 1s
musl	5m 11s
macos-all (macos-26, latest-stable)	3m 45s
	37m 19s

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