docs(changelog): promote v2026.6.23.1-beta [skip changelog]

Updated by .github/workflows/release.yml after publishing v2026.6.23.1-beta.

Author: github-actions[bot]

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable user-visible changes to Parsec CouchLink. The `Unreleased` section i
 
 ## Unreleased
 
+_No notable changes since the last release._
+
+---
+
+## [v2026.6.23.1-beta](https://github.com/RealWhyKnot/ParsecCouchLink/releases/tag/v2026.6.23.1-beta) -- 2026-06-23
+
 ### Added
 - **bluetooth:** Report pairing security contact (d178f4f)