chore: bump github.com/pointfreeco/swift-snapshot-testing from 1.18.0 to 1.18.1 #930

Job	Run time
Examples	1m 44s
xcodebuild (16) (test, IOS, 16.2)	4m 29s
xcodebuild (16) (test, MACOS, 16.2)	3m 30s
xcodebuild (15) (test, IOS, 15.4)	4m 30s
xcodebuild (16) (IOS, 16.2)	2m 10s
xcodebuild (16) (MACOS, 16.2)	2m 35s
xcodebuild (15) (test, MAC_CATALYST, 15.4)	2m 16s
xcodebuild (15) (test, MACOS, 15.4)	2m 53s
xcodebuild (15) (test, TVOS, 15.4)	4m 12s
xcodebuild (15) (test, VISIONOS, 15.4)	1m 48s
xcodebuild (15) (IOS, 15.2)	2m 34s
xcodebuild (15) (IOS, 15.4)	1m 56s
xcodebuild (15) (MAC_CATALYST, 15.4)	3m 6s
xcodebuild (15) (MACOS, 15.2)	2m 30s
xcodebuild (15) (MACOS, 15.4)	2m 18s
xcodebuild (15) (TVOS, 15.4)	2m 24s
xcodebuild (15) (VISIONOS, 15.4)	3m 14s
xcodebuild (15) (WATCHOS, 15.4)	3m 19s
	51m 28s

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