chore(deps): update external/libexpat digest to 776417e #169

Job	Run time
lib_android (monero)	27m 38s
lib_darwin (monero)	13m 37s
ios build (monero)	11m 40s
lib_android (wownero)	26m 3s
lib_darwin (wownero)	13m 26s
ios build (wownero)	11m 8s
lib_linux (monero)	28m 18s
macos build (monero)	3m 15s
lib_linux (wownero)	29m 23s
macos build (wownero)	3m 12s
lib_mingw (monero)	3m 19s
lib_sailfishos_aarch64 (monero)	3m 15s
lib_mingw (wownero)	3m 30s
lib_sailfishos_i486 (monero)	2m 48s
lib_sailfishos_aarch64 (wownero)	3m 17s
lib_sailfishos_i486 (wownero)	2m 44s
test ts library	52s
create single release file	46s
comment on pr	4s
	3h 8m 15s

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