chore(deps): update external/libsodium digest to 42db957 #488

Job	Run time
lib_android (monero)	24m 49s
lib_darwin (monero)	13m 54s
lib_android (wownero)	26m 12s
lib_darwin (wownero)	13m 37s
ios build (monero)	1m 28s
ios build (wownero)	1m 40s
macos build (monero)	1m 34s
macos build (wownero)	1m 26s
lib_linux (monero)	3m 2s
lib_mingw (monero)	3m 48s
lib_linux (wownero)	3m 16s
lib_mingw (wownero)	3m 41s
lib_sailfishos_aarch64 (monero)	10m 50s
lib_sailfishos_i486 (monero)	8m 7s
lib_sailfishos_aarch64 (wownero)	10m 47s
lib_sailfishos_i486 (wownero)	7m 41s
integration_check (monero)	1m 42s
regression_check (monero)	1m 5s
test ts library	49s
integration_check (wownero)	1m 25s
regression_check (wownero)	50s
comment on pr	0s
create single release file	0s
	2h 21m 43s

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