bitcoin: Set version number

During the recent release cycle we left `bitcoin` on the last rc
version.

Set the version number to the current release, as it is for all the
other crates in the workspace.

Close: #2724

bitcoin/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "bitcoin"
-version = "0.32.0-rc1"
+version = "0.32.0"
 authors = ["Andrew Poelstra <apoelstra@wpsoftware.net>"]
 license = "CC0-1.0"
 repository = "https://github.com/rust-bitcoin/rust-bitcoin/"