use updated API for VSeq (see cryptol #1437) #4143

Job	Run time
config	11s
build-push-image	0s
build (ubuntu-22.04, 3.10.3.0, 9.4.8, true, false)	5m 1s
build (ubuntu-22.04, 3.10.3.0, 9.6.6, true, false)	5m 43s
build (ubuntu-22.04, 3.10.3.0, 9.8.2, true, false)	4m 52s
build (ubuntu-20.04, 9.4.8, 3.10.3.0, false, false)	4m 27s
build (ubuntu-22.04, 9.4.8, 3.10.3.0, true, true)	5m 18s
build (windows-2019, 9.4.8, true, false)	5m 42s
build (macos-13, 9.4.8, true, false)	9m 43s
build (macos-14, 9.4.8, true, false)	5m 56s
heapster-tests	0s
mr-solver-tests	0s
cabal-test	0s
saw-remote-api-tests	0s
Run integration tests with coverage reporting	0s
Test SAW exercises	0s
Test s2n proofs	0s
mergify	0s
	46m 53s

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