CHANGELOG: add PR number for codecov v7 entry

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: turegjorup

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Add economics service and sync action/command for service agreement synchronization
 - [#81](https://github.com/itk-dev/devops_itksites/pull/81) 5564: Asset Mapper migration
   - Add Symfony Asset Mapper bundle and importmap
-- Update `codecov/codecov-action` to v7
+- [#87](https://github.com/itk-dev/devops_itksites/pull/87) Update `codecov/codecov-action` to v7
 
 ## [1.11.2] - 2026-06-02