refactor: Upgrade svelvet #817

Job	Run time
changes	4s
run-checks (ubuntu-latest, stable)	3m 8s
run-checks (ubuntu-latest, nightly)	3m 50s
run-docs	5m 40s
run-tests (ubuntu-latest, stable, all)	14m 4s
run-deny	1m 47s
run-checks (macos-latest, stable)	1m 27s
run-tests (ubuntu-latest, stable, none)	9m 39s
run-checks (macos-latest, nightly)	4m 13s
run-tests-windows (stable, all)	14m 1s
run-tests (ubuntu-latest, nightly, all)	7m 0s
run-checks (windows-latest, stable)	7m 45s
run-tests (ubuntu-latest, nightly, none)	3m 2s
run-tests-windows (stable, none)	8m 43s
run-checks (windows-latest, nightly)	10m 1s
run-tests (macos-latest, stable, all)	5m 37s
run-tests-windows (nightly, all)	12m 48s
run-tests (macos-latest, stable, none)	6m 21s
run-tests-windows (nightly, none)	8m 18s
run-tests (macos-latest, nightly, all)	8m 10s
run-tests (macos-latest, nightly, none)	6m 17s
	2h 21m 55s

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