Clone submodule #6

Job	Run time
extension	46s
build	1m 16s
smoke	2m 25s
test (windows-latest)	9m 16s
test (concurrent test programs)	6m 59s
test (no submodules)	1m 40s
test (ubuntu-latest)	6m 44s
test (race mode)	1s
format	1m 31s
baselines	3m 49s
generate	1m 58s
misc	38s
test (macos-latest)	4m 43s
lint (windows-latest)	8m 14s
test (noembed)	2m 44s
lint (noembed)	1m 36s
tidy	34s
lint (macos-latest)	1m 34s
lint (ubuntu-latest)	1m 39s
required	2s
	58m 9s

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