docs: add release notes for v1.1.56

Author: github-actions[bot]

release_notes/v1.1.56.md

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+## [1.1.56](https://github.com/NHSDigital/eps-FHIR-validator-lambda/compare/v1.1.55...v1.1.56) (2026-03-30)
+
+
+### Chore
+
+* [AEA-0000] - add workflow to update dev container (#486) ([99ef9e6](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/99ef9e6c2bce7988622210f9ecce1e3088082974))
+* [AEA-0000] - Dependabot cooldown (#487) ([071d3c1](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/071d3c1c11a27db327f9f49cccea0bcf1d8c44e5))
+
+### Upgrade
+
+* [dependabot] - bump requests from 2.32.5 to 2.33.0 in the pip group across 1 directory (#488) ([1fcb273](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/1fcb273c394d76d3de54f2806308823148e387bf))
+* [dependabot] - Update devcontainer image version to v1.2.0 (#489) ([5d30bce](https://github.com/NHSDigital/eps-FHIR-validator-lambda/commit/5d30bce625ef0ef7e7d82b4659bf7b4e7ad285ff))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-FHIR-validator-lambda/actions/runs/23739591344) - Workflow ID: 23739591344
+
+It was initialized by [MatthewPopat-NHS](https://github.com/MatthewPopat-NHS)
+
+