use @scure/base

[dynst]

https://github.com/bitcoinjs/bitcoinjs-lib/blob/248789d25b9833ed286c9ca4b9bfd93f099fd8a3/ts_src/address.ts#L15-L16

@noble/hashes is already in use. All 3 of these encoding libraries could be replaced by @scure/base by the same author.