chore: bump sdk to 0.8.4 #49

Job	Run time
rust-library-base / Base Checks / doctest	1m 32s
rust-library-base / Feature Checks	55s
rust-library-base / Base Checks / Test Suite	1m 30s
rust-library-base / Base Checks / Rustfmt	36s
rust-library-base / Base Checks / Clippy	3m 5s
rust-library-base / Base Checks / Docs	1m 11s
	8m 49s

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