chore: bump to buildifier 6.4.0 (#97) #264

Job	Run time
test / matrix-prep-bazelversion	4s
test / matrix-prep-os	1s
test / test (ubuntu-latest, 7.0.2, ., true)	31s
test / test (ubuntu-latest, 7.0.2, e2e/smoke, true)	21s
test / test (ubuntu-latest, 7.0.2, e2e/smoke, false)	16s
test / test (ubuntu-latest, 6.4.0, ., true)	30s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	25s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 34s
test / test (windows-latest, 7.0.2, ., true)	28s
test / test (windows-latest, 7.0.2, e2e/smoke, true)	3m 1s
test / test (windows-latest, 7.0.2, e2e/smoke, false)	54s
test / test (windows-latest, 6.4.0, ., true)	29s
test / test (windows-latest, 6.4.0, e2e/smoke, true)	1m 0s
test / test (windows-latest, 6.4.0, e2e/smoke, false)	53s
test / test (macos-latest, 7.0.2, ., true)	1m 4s
test / test (macos-latest, 7.0.2, e2e/smoke, true)	24s
test / test (macos-latest, 7.0.2, e2e/smoke, false)	24s
test / test (macos-latest, 6.4.0, ., true)	1m 0s
test / test (macos-latest, 6.4.0, e2e/smoke, true)	2m 40s
test / test (macos-latest, 6.4.0, e2e/smoke, false)	27s
	17m 26s

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