Update PQClean to 7707d1b #95

Job	Run time
build-wasm	1m 29s
test-native (ubuntu-latest, 18.x)	1m 47s
test-native (ubuntu-latest, 20.x)	1m 28s
test-native (ubuntu-latest, 21.x)	1m 25s
test-native (macOS-latest, 18.x)	2m 21s
test-native (macOS-latest, 20.x)	1m 55s
test-native (macOS-latest, 21.x)	2m 27s
test-native (windows-latest, 18.x)	4m 54s
test-native (windows-latest, 20.x)	3m 39s
test-native (windows-latest, 21.x)	3m 39s
build-web	6s
test-wasm (ubuntu-latest, 18.x)	3m 35s
test-wasm (ubuntu-latest, 20.x)	7m 2s
test-wasm (ubuntu-latest, 21.x)	3m 56s
test-wasm (macOS-latest, 18.x)	5m 53s
test-wasm (macOS-latest, 20.x)	4m 38s
test-wasm (macOS-latest, 21.x)	8m 0s
test-wasm (windows-latest, 18.x)	6m 14s
test-wasm (windows-latest, 20.x)	8m 51s
test-wasm (windows-latest, 21.x)	8m 10s
test-web (deno, ubuntu-latest)	4m 18s
test-web (deno, macOS-latest)	7m 38s
test-web (deno, windows-latest)	6m 36s
test-web (chrome, ubuntu-latest)	4m 12s
test-web (chrome, macOS-latest)	5m 40s
test-web (chrome, windows-latest)	7m 19s
	1h 57m 12s

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