Prepare changelog for 0.23.1 release (#533)

Author: radeksimko

CHANGELOG.md

@@ -1,3 +1,17 @@
+# 0.23.1 (Unreleased)
+
+BUG FIXES:
+
+* Avoid closing stdio pipes early on graceful (SIGINT-based) cancellation ([#527](https://github.com/hashicorp/terraform-exec/pull/527))
+  - This enables correct handling of graceful cancellation for recent versions of Terraform (1.1+). Older versions should use `SetEnableLegacyPipeClosing(true)` to avoid hanging on cancellation.
+
+INTERNAL:
+
+* bump github.com/cloudflare/circl from 1.6.0 to 1.6.1 ([#524](https://github.com/hashicorp/terraform-exec/pull/524))
+* bump github.com/hashicorp/terraform-json from 0.24.0 to 0.26.0 ([#520](https://github.com/hashicorp/terraform-exec/pull/520) & [#529](https://github.com/hashicorp/terraform-exec/pull/529))
+* bump github.com/zclconf/go-cty from 1.16.2 to 1.16.4 ([#522](https://github.com/hashicorp/terraform-exec/pull/522) & [#532](https://github.com/hashicorp/terraform-exec/pull/532))
+* bump golang.org/x/net from 0.36.0 to 0.38.0 ([#515](https://github.com/hashicorp/terraform-exec/pull/515))
+
 # 0.23.0 (April 10, 2025)
 
 ENHANCEMENTS: