chore(deps): update external/libzmq digest to 1f4dd54 #54

Job	Run time
lib_android (monero)	25m 41s
lib_android (wownero)	26m 5s
lib_mingw (monero)	3m 45s
lib_mingw (wownero)	3m 16s
lib_darwin (monero)	13m 44s
lib_darwin (wownero)	13m 35s
ios build (monero)	11m 28s
ios build (wownero)	12m 52s
lib_linux (monero)	3m 1s
lib_linux (wownero)	2m 37s
macos build (monero)	3m 42s
macos build (wownero)	4m 1s
lib_sailfishos_aarch64 (monero)	3m 52s
lib_sailfishos_i486 (monero)	2m 17s
lib_sailfishos_aarch64 (wownero)	3m 22s
lib_sailfishos_i486 (wownero)	2m 11s
wallet_xmruw_android (monero)	6m 45s
wallet_cake_android	19m 58s
wallet_xmruw_android (wownero)	6m 35s
comment on pr	7s
	2h 48m 54s

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