Update changelog on 2025-11-12

Author: changelog[bot]

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project
 tries to adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.5.1](https://github.com/oscar-system/Oscar.jl/releases/tag/v1.5.1) - 2025-11-12
+
+The following gives an overview of the changes compared to the previous release. This list is not
+complete, many more internal or minor changes were made, but we tried to only list those changes
+which we think might affect some users directly.
+
 ## [1.5.0](https://github.com/oscar-system/Oscar.jl/releases/tag/v1.5.0) - 2025-09-11
 
 The following gives an overview of the changes compared to the previous release. This list is not