chore: allow `future_not_send` lint at workspace level #705

Job	Run time
Format and Check Deps	1m 4s
detect-changes	6s
Test (macos-latest, x86_64-apple-darwin)	6m 31s
Test (windows-latest, x86_64-pc-windows-msvc)	6m 48s
Test (ubuntu-latest, x86_64-unknown-linux-gnu)	2m 12s
Clippy	1m 13s
Test (macos-latest, aarch64-apple-darwin)	1m 50s
done	3s
	19m 47s

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