docs: add release notes for v5.8.2

Author: github-actions[bot]

release_notes/v5.8.2.md

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+## [5.8.2](https://github.com/NHSDigital/eps-common-workflows/compare/v5.8.1...v5.8.2) (2026-03-19)
+
+
+### Upgrade
+
+* [dependabot] - bump @aws-sdk/client-cloudformation from 3.1011.0 to 3.1013.0 (#100) ([d11a9ab](https://github.com/NHSDigital/eps-common-workflows/commit/d11a9abb6061c8876572c464b042e68aa3b52a35))
+* [dependabot] - bump @aws-sdk/client-lambda from 3.1011.0 to 3.1013.0 (#101) ([cbf6acc](https://github.com/NHSDigital/eps-common-workflows/commit/cbf6accf7046caab1ac27f94ed64ed90086abb11))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-common-workflows/actions/runs/23319503557) - Workflow ID: 23319503557
+
+It was initialized by [eps-autoapprove-dependabot[bot]](https://github.com/apps/eps-autoapprove-dependabot)
+
+