docs: add release notes for v1.0.4

Author: github-actions[bot]

release_notes/v1.0.4.md

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+## [1.0.4](https://github.com/NHSDigital/eps-update-devcontainer/compare/v1.0.3...v1.0.4) (2026-04-15)
+
+
+### Upgrade
+
+* [dependabot] - Bump NHSDigital/eps-common-workflows/.github/workflows/dependabot-auto-approve-and-merge.yml from 5.8.19 to 5.8.23 (#9) ([939ca2c](https://github.com/NHSDigital/eps-update-devcontainer/commit/939ca2cdb49e2e8c3cb9c9a3d625129df1c7c778))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/get-repo-config.yml from 5.8.19 to 5.8.23 (#13) ([83f4b56](https://github.com/NHSDigital/eps-update-devcontainer/commit/83f4b56f1942635f2c05b7fe569142459b8c3882))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/pr_title_check.yml from 5.8.19 to 5.8.23 (#14) ([8d1f81e](https://github.com/NHSDigital/eps-update-devcontainer/commit/8d1f81ea5c25ea66a5cc36895fec93e3fb2e4d8a))
+* [dependabot] - bump NHSDigital/eps-copilot-instructions from 1.0.3 to 1.0.4 (#10) ([f456c3b](https://github.com/NHSDigital/eps-update-devcontainer/commit/f456c3b8c08ebfb10ba0c82f2f01b60023140fcc))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-update-devcontainer/actions/runs/24444409447) - Workflow ID: 24444409447
+
+It was initialized by []()
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+