Merge bitcoindevkit/bdk#1259: Bump `bip39` dependency to v2.0 #1010

Job	Run time
Check no_std	41s
Check WASM	1m 11s
clippy_check	57s
Build and test (stable, true, --no-default-features)	3m 55s
Build and test (stable, true, --all-features)	4m 6s
Build and test (1.63.0, --no-default-features)	6m 31s
Build and test (1.63.0, --all-features)	7m 25s
Rust fmt	13s
	24m 59s

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