Update changelog

Author: ja573

CHANGELOG.md

@@ -5,10 +5,13 @@ 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).
 
 ## [Unreleased]
+### Security
+  - Upgrade `openssl` to v0.10.79
 
 ## [[1.3.0]](https://github.com/thoth-pub/thoth/releases/tag/v1.3.0) - 2026-05-06
 ### Fixed
   - [749](https://github.com/thoth-pub/thoth/pull/749) - Correct locale code formatting in Crossref metadata output
+
 ### Changed
   - [749](https://github.com/thoth-pub/thoth/pull/749) - Remove ISBN limit in Crossref metadata output (introduced in v0.8.7)
   - [748](https://github.com/thoth-pub/thoth/pull/748) - Require endorsement author names and featured video titles