docs: add release notes for v1.0.5

Author: github-actions[bot]

release_notes/v1.0.5.md

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+## [1.0.5](https://github.com/NHSDigital/eps-copilot-instructions/compare/v1.0.4...v1.0.5) (2026-04-15)
+
+
+### Upgrade
+
+* [dependabot] - Bump NHSDigital/eps-common-workflows/.github/workflows/dependabot-auto-approve-and-merge.yml from 5.8.18 to 5.8.23 (#12) ([003048b](https://github.com/NHSDigital/eps-copilot-instructions/commit/003048b0e30c83654c5da98820e6225ca1983a55))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/get-repo-config.yml from 5.8.18 to 5.8.23 (#16) ([9195cda](https://github.com/NHSDigital/eps-copilot-instructions/commit/9195cdae27f008478fea6d383c403f3519fcbdb0))
+* [dependabot] - bump NHSDigital/eps-common-workflows/.github/workflows/pr_title_check.yml from 5.8.18 to 5.8.23 (#14) ([e6e445a](https://github.com/NHSDigital/eps-copilot-instructions/commit/e6e445a93671466398e3f79d20cf1f64885150d8))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-copilot-instructions/actions/runs/24444630942) - Workflow ID: 24444630942
+
+It was initialized by []()
+
+