Update version and changelog for concordium-std.

Author: abizjak

concordium-std/CHANGELOG.md

@@ -2,10 +2,13 @@
 
 ## Unreleased changes
 
-- Fix a bug that caused a linking error when using `concordium_dbg!`.
+## concordium-std 9.0.1 (2024-01-26)
+
+- Fix a bug that caused a linking error when using `concordium_dbg!` on some
+  platforms.
   - The error message states that `_debug_print` cannot be found.
 
-## concordium-std 6.0.0 (2024-01-22)
+## concordium-std 9.0.0 (2024-01-22)
 
 - Add a `concordium_dbg!` macro and the associated `debug` feature to enable,
   together with `cargo concordium`, to emit debug information during contract

concordium-std/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "concordium-std"
-version = "9.0.0"
+version = "9.0.1"
 authors = ["Concordium <[email protected]>"]
 edition = "2021"
 rust-version = "1.66"