docs: add release notes for v1.4.6

Author: github-actions[bot]

release_notes/v1.4.6.md

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+## [1.4.6](https://github.com/NHSDigital/eps-devcontainers/compare/v1.4.5...v1.4.6) (2026-04-14)
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+
+### Chore
+
+* [AEA-0000] - more vulnerabilities ignore (#93) ([39c8244](https://github.com/NHSDigital/eps-devcontainers/commit/39c82443e2912b4b30376ec1c0cc4ce57cffbc5d))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-devcontainers/actions/runs/24391128306) - Workflow ID: 24391128306
+
+It was initialized by [anthony-nhs](https://github.com/anthony-nhs)
+
+