docs: add release notes for v1.0.3

Author: github-actions[bot]

release_notes/v1.0.3.md

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+## [1.0.3](https://github.com/NHSDigital/eps-update-devcontainer/compare/v1.0.2...v1.0.3) (2026-04-08)
+
+
+### Docs
+
+* [AEA-0000] - update common docs (#7) ([36df1cf](https://github.com/NHSDigital/eps-update-devcontainer/commit/36df1cff63369da85b03fd7bf671ac7c6999ca94))
+* [AEA-0000] - update example (#6) ([d1cd05a](https://github.com/NHSDigital/eps-update-devcontainer/commit/d1cd05a740b5f03514e2cd92495e35377ccd0eb4))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-update-devcontainer/actions/runs/24125392723) - Workflow ID: 24125392723
+
+It was initialized by []()
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+