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

Bumps [NHSDigital/eps-copilot-instructions](https://github.com/nhsdigital/eps-copilot-instructions) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/nhsdigital/eps-copilot-instructions/releases)
- [Commits](NHSDigital/eps-copilot-instructions@304ab2f...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@304ab2f4b7cdc15a1d7c0a0fae5290fad41b2451
+              uses: NHSDigital/eps-copilot-instructions@8b4d7f546fe9825a149cb8cc8cfdb31df58c3730
               with:
                   copilot_instructions_ref: main
                   calling_repo_base_branch: main