chore: upgrade next to 16.3.8 to address CVE-2026-94545 (#1709)

* chore: upgrade next to 16.3.8

* docs: update changelog for #1709

* chore: address dependency review feedback

---------

Co-authored-by: Jack Minnetian <270441393+BlueBottleLatte@users.noreply.github.com>

Author: jsourcebot

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Silenced a false-positive `MaxListenersExceededWarning` logged on every request proxied through an external rewrite. [#1697](https://github.com/sourcebot-dev/sourcebot/pull/1697)
+- Upgraded `next` to `^16.3.8`. [#1709](https://github.com/sourcebot-dev/sourcebot/pull/1709)
 
 ## [5.1.15] - 2026-09-29