Upgrade bech32 dependency

[optout21]

#3100 (comment)

LDK currently uses bech32 0.9.1 (Aug'22 https://github.com/rust-bitcoin/rust-bech32/releases/tag/v0.9.1).
Latest version is 0.11.0, and 0.10 was a major rewrite.
Currently used bitcoin 0.31.2 uses bech32 0.10.0-beta. Latest bitcoin 0.32.2 uses bech32 0.11.0.

[tnull]

We discussed offline that, while we def. should upgrade bech32, upgrading bitcoin has priority for the coming release and could happen independently.