Fetch only back as far as the PR could be #12

Job	Run time
extension	50s
lint (noembed)	1m 34s
build	1m 22s
lint (windows-latest)	17m 36s
lint (macos-latest)	1m 47s
lint (ubuntu-latest)	1m 37s
test (windows-latest)	15m 37s
test (ubuntu-latest)	6m 50s
test (macos-latest)	5m 15s
generate	1m 54s
test (race mode)	1s
test (noembed)	2m 34s
test (no submodules)	1m 47s
test (concurrent test programs)	7m 0s
baselines	3m 56s
format	1m 24s
tidy	34s
smoke	2m 30s
misc	35s
required	3s
	1h 14m 46s

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