chore(deps): update external/libexpat digest to fd1a3bc #480

Job	Run time
lib_android (monero)	24m 14s
ios build (monero)	1m 45s
lib_darwin (monero)	13m 24s
ios build (wownero)	15s
lib_darwin (wownero)	13m 29s
lib_android (wownero)	24m 37s
lib_linux (monero)	3m 2s
macos build (monero)	1m 25s
lib_linux (wownero)	3m 16s
lib_mingw (monero)	3m 35s
macos build (wownero)	1m 21s
lib_mingw (wownero)	3m 24s
lib_sailfishos_aarch64 (monero)	3m 6s
lib_sailfishos_i486 (monero)	2m 13s
lib_sailfishos_aarch64 (wownero)	3m 9s
lib_sailfishos_i486 (wownero)	1m 58s
regression_check (monero)	1m 12s
test ts library	53s
integration_check (monero)	1m 13s
regression_check (wownero)	55s
integration_check (wownero)	58s
create single release file	0s
comment on pr	0s
	1h 49m 24s

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