build

chore: update num-bigint-dig (#1656) #200

Job	Run time
cargo +1.85 test (ubuntu-latest)	2m 34s
cargo +stable test (windows-latest)	3m 57s
cargo +stable test (ubuntu-latest)	2m 1s
cargo +1.85 test (windows-latest)	4m 37s
	13m 9s

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