chore(deps): update external/libexpat digest to 234654c #60

Job	Run time
lib_android (monero)	26m 45s
lib_android (wownero)	24m 44s
lib_linux (monero)	3m 57s
lib_sailfishos_aarch64 (monero)	3m 39s
lib_linux (wownero)	3m 34s
lib_mingw (monero)	4m 14s
lib_sailfishos_aarch64 (wownero)	3m 34s
lib_mingw (wownero)	3m 55s
lib_darwin (monero)	13m 41s
lib_sailfishos_i486 (monero)	2m 28s
lib_darwin (wownero)	13m 47s
lib_sailfishos_i486 (wownero)	3m 26s
ios build (monero)	11m 17s
macos build (monero)	3m 20s
ios build (wownero)	11m 24s
macos build (wownero)	3m 19s
wallet_xmruw_android (monero)	6m 48s
wallet_cake_android	19m 18s
wallet_xmruw_android (wownero)	7m 7s
comment on pr	6s
	2h 50m 23s

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