docs: add release notes for v5.6.4

Author: github-actions[bot]

release_notes/v5.6.4.md

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+## [5.6.4](https://github.com/NHSDigital/eps-common-workflows/compare/v5.6.3...v5.6.4) (2026-03-09)
+
+
+### Chore
+
+* [AEA-0000] - exclude trigger_release from coverage (#84) ([547898a](https://github.com/NHSDigital/eps-common-workflows/commit/547898aacbff500158cb5f5a7c69677cb34add6a))
+
+### Upgrade
+
+* [dependabot] - bump actions/download-artifact from 7.0.0 to 8.0.0 (#81) ([e049341](https://github.com/NHSDigital/eps-common-workflows/commit/e049341b7e5918c259f851ae4d01ecb3e0b91d69))
+* [dependabot] - bump actions/upload-artifact from 6.0.0 to 7.0.0 (#79) ([a0e7d98](https://github.com/NHSDigital/eps-common-workflows/commit/a0e7d98598995e88112417a1bf597200177a7473))
+* [dependabot] - bump docker/login-action from 3.7.0 to 4.0.0 (#80) ([dac60c1](https://github.com/NHSDigital/eps-common-workflows/commit/dac60c1e29babc62013e7bb9ade002cb381c4c49))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-common-workflows/actions/runs/22859756038) - Workflow ID: 22859756038
+
+It was initialized by [eps-autoapprove-dependabot[bot]](https://github.com/apps/eps-autoapprove-dependabot)
+
+