docs: add release notes for v1.1.5

Author: github-actions[bot]

release_notes/v1.1.5.md

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+## [1.1.5](https://github.com/NHSDigital/eps-devcontainers/compare/v1.1.4...v1.1.5) (2026-03-20)
+
+
+### Chore
+
+* [AEA-0000] - install chrome (#57) ([7056376](https://github.com/NHSDigital/eps-devcontainers/commit/7056376ca5b5d26696eee107a58890329ce02614))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-devcontainers/actions/runs/23352016499) - Workflow ID: 23352016499
+
+It was initialized by [anthony-nhs](https://github.com/anthony-nhs)
+
+