docs: add release notes for v1.4.3

Author: github-actions[bot]

release_notes/v1.4.3.md

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+## [1.4.3](https://github.com/NHSDigital/eps-devcontainers/compare/v1.4.2...v1.4.3) (2026-04-01)
+
+
+### Chore
+
+* [AEA-0000] - sync copilot (#77) ([9f431f8](https://github.com/NHSDigital/eps-devcontainers/commit/9f431f81bd55dbced2e1ba1397858cc8acfbcbfc))
+* [AEA-0000] - Sync copilot (#80) ([8784807](https://github.com/NHSDigital/eps-devcontainers/commit/8784807e2e777040146a20b120e4ad999e326f2a))
+
+### Upgrade
+
+* [dependabot] - sync Copilot instructions (#81) ([c599587](https://github.com/NHSDigital/eps-devcontainers/commit/c5995872b6cb680198c4e00568b76e88aeb883d2))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-devcontainers/actions/runs/23864059791) - Workflow ID: 23864059791
+
+It was initialized by []()
+
+