chore: release bsv-sdk v0.12.1

Author: sgbett

gem/bsv-sdk/CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to the `bsv-sdk` gem are documented here.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 and this gem adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## 0.12.1 — 2026-04-16
 
 ### Fixed
 

gem/bsv-sdk/lib/bsv/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module BSV
-  VERSION = '0.12.0'
+  VERSION = '0.12.1'
 end