Add CHANGELOG entry for QUANT combine fix (#460)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: jonasscheid

CHANGELOG.md

@@ -10,6 +10,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated to nf-core template 4.0.2 [#454](https://github.com/nf-core/mhcquant/pull/454)
 - Updated all nf-core modules to their latest versions [#454](https://github.com/nf-core/mhcquant/pull/454)
 
+### `Fixed`
+
+- Fixed silent per-sample drop from order-dependent `combine(by:)` in QUANT [#460](https://github.com/nf-core/mhcquant/pull/460)
+
 ### `Dependencies`
 
 | Dependency | Old version | New version |