Bump ComfyUI version to v0.3.19 #617

Job	Run time
test-stable (macos, 3.9, 12.1, stable)	10m 34s
test-stable (macos, 3.10, 12.1, stable)	10m 23s
test-stable (macos, 3.11, 12.1, stable)	10m 29s
test-stable (macos, 3.12, 12.1, stable)	10m 38s
test-stable (linux, 3.9, 12.1, stable)	6m 56s
test-stable (linux, 3.10, 12.1, stable)	5m 57s
test-stable (linux, 3.11, 12.1, stable)	6m 2s
test-stable (linux, 3.12, 12.1, stable)	5m 55s
test-unix-nightly (macos, 3.11, 12.1, nightly)	10m 47s
test-unix-nightly (linux, 3.11, 12.1, nightly)	5m 50s
	1h 23m 31s

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