chore(deps): update external/libexpat digest to b70c8f5 #205

Job	Run time
lib_android (monero)	27m 17s
lib_android (monero)	27m 17s
lib_android (wownero)	27m 16s
lib_android (wownero)	27m 16s
lib_linux (monero)	30m 32s
lib_linux (monero)	30m 32s
lib_linux (wownero)	30m 50s
lib_linux (wownero)	30m 50s
lib_mingw (monero)	3m 26s
lib_mingw (monero)	3m 26s
lib_mingw (wownero)	3m 38s
lib_mingw (wownero)	3m 38s
lib_darwin (monero)	14m 5s
lib_darwin (monero)	14m 5s
lib_darwin (wownero)	13m 43s
lib_darwin (wownero)	13m 43s
ios build (monero)	16m 6s
ios build (monero)	16m 6s
ios build (wownero)	11m 50s
ios build (wownero)	11m 50s
macos build (monero)	3m 33s
macos build (monero)	3m 33s
lib_sailfishos_aarch64 (monero)	3m 9s
lib_sailfishos_aarch64 (monero)	3m 9s
macos build (wownero)	3m 20s
macos build (wownero)	3m 20s
lib_sailfishos_aarch64 (wownero)	3m 5s
lib_sailfishos_aarch64 (wownero)	3m 5s
lib_sailfishos_i486 (monero)	2m 9s
lib_sailfishos_i486 (monero)	2m 9s
lib_sailfishos_i486 (wownero)	2m 18s
lib_sailfishos_i486 (wownero)	2m 18s
test ts library	47s
test ts library	47s
regression_check (monero)	2m 34s
regression_check (monero)	2m 59s
create single release file	42s
create single release file	42s
comment on pr	7s
comment on pr	7s
regression_check (wownero)	1m 59s
regression_check (wownero)	1m 59s
	6h 45m 17s

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