docs: add release notes for v5.6.5

Author: github-actions[bot]

release_notes/v5.6.5.md

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+## [5.6.5](https://github.com/NHSDigital/eps-common-workflows/compare/v5.6.4...v5.6.5) (2026-03-12)
+
+
+### Chore
+
+* [AEA-0000] - stagger dependabot (#88) ([ee437c0](https://github.com/NHSDigital/eps-common-workflows/commit/ee437c09a9cdae970785be341a66bb4a817c9eb4))
+
+### Upgrade
+
+* [dependabot] - bump actions/download-artifact from 8.0.0 to 8.0.1 (#89) ([a900639](https://github.com/NHSDigital/eps-common-workflows/commit/a9006399b56ed2a9bf066bfa2eb84a26b7e3630f))
+* [dependabot] - bump aquasecurity/trivy-action from 0.34.2 to 0.35.0 (#91) ([0c823d8](https://github.com/NHSDigital/eps-common-workflows/commit/0c823d889ee6521f4524ccf097503007154047b1))
+* [dependabot] - bump semantic-release-pypi from 5.1.3 to 5.2.0 (#90) ([14bf1b5](https://github.com/NHSDigital/eps-common-workflows/commit/14bf1b5a428a41ca7a18bb7766794352cdee9b64))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-common-workflows/actions/runs/23002139669) - Workflow ID: 23002139669
+
+It was initialized by [eps-autoapprove-dependabot[bot]](https://github.com/apps/eps-autoapprove-dependabot)
+
+