docs: add release notes for v5.8.13

Author: github-actions[bot]

release_notes/v5.8.13.md

@@ -0,0 +1,13 @@
+## [5.8.13](https://github.com/NHSDigital/eps-common-workflows/compare/v5.8.12...v5.8.13) (2026-03-27)
+
+
+### Chore
+
+* [AEA-0000] - fix update-dev-container-workflow (#113) ([23342d8](https://github.com/NHSDigital/eps-common-workflows/commit/23342d86a245c076937abd6aecdd0ce06446b1e6))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-common-workflows/actions/runs/23642037366) - Workflow ID: 23642037366
+
+It was initialized by [anthony-nhs](https://github.com/anthony-nhs)
+
+