build(deps): update bech32 requirement from 0.8.1 to 0.9.1 (#177)

Updates the requirements on [bech32](https://github.com/rust-bitcoin/rust-bech32) to permit the latest version.
- [Release notes](https://github.com/rust-bitcoin/rust-bech32/releases)
- [Commits](https://github.com/rust-bitcoin/rust-bech32/commits/v0.9.1)

---
updated-dependencies:
- dependency-name: bech32
  dependency-type: direct:production
...

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pallas-addresses/Cargo.toml

@@ -17,5 +17,5 @@ hex = "0.4.3"
 pallas-crypto = { version = "0.13.0", path = "../pallas-crypto" }
 pallas-codec = { version = "0.13.0", path = "../pallas-codec" }
 base58 = "0.2.0"
-bech32 = "0.8.1"
+bech32 = "0.9.1"
 thiserror = "1.0.31"