chore(deps): update coins-bip39 requirement from 0.11 to 0.12 (#73)

Updates the requirements on [coins-bip39](https://github.com/summa-tx/coins) to permit the latest version.
- [Commits](https://github.com/summa-tx/coins/commits)

---
updated-dependencies:
- dependency-name: coins-bip39
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

benchmark/Cargo.toml

@@ -12,7 +12,7 @@ criterion = "0.5"
 # BIP-0039 benchmarks
 bip0039 = { path = "../bip0039" }
 bip39 = { package = "tiny-bip39", version = "1.0" }
-coins-bip39 = "0.11"
+coins-bip39 = "0.12"
 rand = "0.8"
 
 [[bench]]