chore: upgrade seroval to ^1.5.6 to address CVE-2026-59940 (#1508)

* chore: upgrade seroval to 1.5.6

* docs: add changelog entry for seroval upgrade

---------

Co-authored-by: Jack Minnetian <270441393+BlueBottleLatte@users.noreply.github.com>
Co-authored-by: Brendan Kellam <brendan@sourcebot.dev>

Author: jsourcebot

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- Upgraded `seroval` to `^1.5.6`. [#1508](https://github.com/sourcebot-dev/sourcebot/pull/1508)
+
 ### Changed
 - Vulnerability triage now keeps Linear issues synchronized with current security findings.
 

yarn.lock

@@ -21441,9 +21441,9 @@ __metadata:
   linkType: hard
 
 "seroval@npm:~1.5.0":
-  version: 1.5.0
-  resolution: "seroval@npm:1.5.0"
-  checksum: 10c0/aff16b14a7145388555cefd4ebd41759024ee1c2c064080fd8d4fabea4b7c89d103155cd98f5109523b8878e577da73cc6cd8abf98965f2d1f0ba19dc38317ab
+  version: 1.5.6
+  resolution: "seroval@npm:1.5.6"
+  checksum: 10c0/47e4fb25305bf05fdf300cac6b0d4aaaaf1e12f15c819195afcdf512d88901a3f1f7754ac5a2de740cc0bb04e912c653fbf0129fb3e4c81ce12809e6aa5815e3
   languageName: node
   linkType: hard