Bump bech32 from 0.7.3 to 0.9.1 in /rust

[dependabot[bot]]

Bumps bech32 from 0.7.3 to 0.9.1.

Commits

• d12513f Merge rust-bitcoin/rust-bech3232: Revert encode_to_fmt API change
• 0d01fad Bump version to 0.9.1
• 3693935 Revert encode_to_fmt API change
• 3e93f95 Merge rust-bitcoin/rust-bech3232: Install gcc-arm-none-eabi in embedded ci job
• 091240e Install gcc-arm-none-eabi in embedded ci job
• 6df4a67 Merge rust-bitcoin/rust-bech3232: Support bech32 encoding without a checksum
• 86edca9 Support bech32 encoding without a checksum
• 0ef5bb9 Add an Error variant for fmt::Error
• 1735cb3 Use a constant for checksum length
• fa306e6 Merge rust-bitcoin/rust-bech3232: Remove unused lifetime
• Additional commits viewable in compare view

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