chore(deps): update external/polyseed digest to dfb05d8 #76

Job	Run time
lib_android (monero)	27m 33s
lib_android (wownero)	24m 54s
lib_linux (monero)	2m 58s
lib_mingw (monero)	3m 35s
lib_linux (wownero)	2m 37s
lib_mingw (wownero)	3m 37s
lib_sailfishos_aarch64 (monero)	3m 53s
lib_sailfishos_aarch64 (wownero)	3m 9s
lib_darwin (monero)	13m 32s
lib_darwin (wownero)	13m 27s
ios build (monero)	9m 38s
macos build (monero)	3m 0s
ios build (wownero)	11m 32s
macos build (wownero)	4m 48s
lib_sailfishos_i486 (monero)	2m 31s
lib_sailfishos_i486 (wownero)	2m 54s
wallet_cake_android	21m 6s
wallet_xmruw_android (monero)	6m 55s
wallet_xmruw_android (wownero)	8m 4s
comment on pr	3s
	2h 49m 46s

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