Release block-buffer v0.12.1 (#1488)

### Fixed
- Exception safety bug ([#1487])

[#1487]: #1487

Author: newpavlov

Cargo.lock

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 0.12.1 (UNRELEASED)
+## 0.12.1 (2026-06-11)
 ### Fixed
 - Exception safety bug ([#1487])
 

block-buffer/CHANGELOG.md

@@ -1,6 +1,6 @@
 [package]
 name = "block-buffer"
-version = "0.12.0"
+version = "0.12.1"
 authors = ["RustCrypto Developers"]
 edition = "2024"
 rust-version = "1.85"