chore(deps): update external/libzmq digest to 90b4f41 #124

Job	Run time
lib_mingw (monero)	3m 25s
lib_mingw (wownero)	3m 4s
lib_darwin (monero)	13m 48s
lib_android (monero)	25m 37s
lib_darwin (wownero)	14m 9s
lib_android (wownero)	27m 11s
lib_linux (monero)	29m 16s
lib_linux (wownero)	29m 46s
lib_sailfishos_aarch64 (monero)	3m 19s
lib_sailfishos_i486 (monero)	3m 19s
lib_sailfishos_aarch64 (wownero)	3m 37s
lib_sailfishos_i486 (wownero)	2m 12s
ios build (monero)	11m 48s
ios build (wownero)	10m 28s
macos build (monero)	3m 19s
macos build (wownero)	3m 10s
test ts library	1m 13s
wallet_cake_android	22m 32s
create single release file	26s
comment on pr	3s
	3h 31m 42s

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