switch to using node20 #348

Job	Run time
test_inferred_channels (2.12.0-29.10.beta)	13s
test_arch	17s
test (ubuntu-latest, 2.12.4)	27s
test_latest_patch_release (2.19)	14s
test (ubuntu-latest, stable)	23s
test_latest_patch_release (3)	15s
test_raw (ubuntu-latest, dev, raw)	11s
test (ubuntu-latest, beta)	24s
test_latest_patch_release (3.1)	13s
test_raw (ubuntu-latest, main, raw)	13s
test (ubuntu-latest, dev)	24s
test (macos-latest, 2.12.4)	1m 2s
test_raw (macos-latest, dev, raw)	22s
test (macos-latest, stable)	51s
test_raw (macos-latest, main, raw)	27s
test (macos-latest, beta)	56s
test_raw (windows-latest, dev, raw)	17s
test (macos-latest, dev)	41s
test_raw (windows-latest, main, raw)	16s
test (windows-latest, 2.12.4)	38s
test (windows-latest, stable)	41s
test (windows-latest, beta)	39s
test (windows-latest, dev)	36s
	10m 40s

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