docs: add Next route cache fix to changelog

Author: brendan-kellam

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Fixed
+- Upgraded Next.js to 16.3.1 to bound memory retained by high-cardinality dynamic route cache entries. [#1594](https://github.com/sourcebot-dev/sourcebot/pull/1594)
 - Fixed memory leak attributed to CodeMirror allocating objects on heap that were never freed. [#1580](https://github.com/sourcebot-dev/sourcebot/pull/1580)
 - Kept Git provider credentials out of subprocess arguments and on-disk configuration by using isolated in-memory credential caches. [#1584](https://github.com/sourcebot-dev/sourcebot/pull/1584)