Upgrade: [dependabot] - bump NHSDigital/eps-copilot-instructions

Bumps [NHSDigital/eps-copilot-instructions](https://github.com/nhsdigital/eps-copilot-instructions) from 1.0.2 to 1.0.4.
- [Release notes](https://github.com/nhsdigital/eps-copilot-instructions/releases)
- [Commits](NHSDigital/eps-copilot-instructions@a7849a1...8b4d7f5)

---
updated-dependencies:
- dependency-name: NHSDigital/eps-copilot-instructions
  dependency-version: 1.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/sync_copilot.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Sync shared instructions
-        uses: NHSDigital/eps-copilot-instructions@a7849a16aabd5c1edef13e29467a480fa08555f8
+        uses: NHSDigital/eps-copilot-instructions@8b4d7f546fe9825a149cb8cc8cfdb31df58c3730
         with:
           copilot_instructions_ref: main
           calling_repo_base_branch: main