Update bip32 requirement from 0.3 to 0.4

[dependabot[bot]]

Updates the requirements on bip32 to permit the latest version.

Commits

• 6258e46 bip32 v0.3.0 (#943)
• 61d01c3 bip32: bump secp256k1 (FFI) dependency to v0.21 (#942)
• 0eca7f6 build(deps): bump tokio from 1.13.0 to 1.15.0 (#931)
• e021ca4 build(deps): bump rust_decimal from 1.17.0 to 1.19.0 (#934)
• 7e3c452 Add impl for std::error::Error (#932)
• e9cfe6a build(deps): bump tendermint from 0.23.0 to 0.23.3 (#933)
• 1466755 Bump k256 dependency to v0.10 (#938)
• 91b60b4 Remove TryFrom/TryInto imports (#937)
• 49f910d Remove anomaly and zeroize (#924)
• 2753c65 anomaly: retire crate (#918)
• Additional commits viewable in compare view

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[dependabot[bot]]

Dependabot tried to update this pull request, but something went wrong. We're looking into it, but in the meantime you can retry the update by commenting @dependabot rebase.

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.