chore(deps): update external/polyseed digest to dfb05d8 #36

Job	Run time
lib_android (monero)	1s
lib_linux (monero)	1s
lib_android (wownero)	1s
lib_linux (wownero)	1s
lib_mingw (monero)	1s
lib_mingw (wownero)	1s
lib_sailfishos_aarch64 (monero)	1s
lib_sailfishos_aarch64 (wownero)	1s
lib_darwin (monero)	1s
ios build (monero)	1s
macos build (monero)	1s
lib_darwin (wownero)	1s
ios build (wownero)	1s
macos build (wownero)	1s
lib_sailfishos_i486 (monero)	1s
lib_sailfishos_i486 (wownero)	1s
wallet_cake_android	1s
wallet_xmruw_android	1s
comment on pr	1s
	19s

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