chore: (deps): bump scitools/workflows/.github/workflows/ci-manifest.yml (#258)

Bumps the dependencies group with 1 update: [scitools/workflows/.github/workflows/ci-manifest.yml](https://github.com/scitools/workflows).


Updates `scitools/workflows/.github/workflows/ci-manifest.yml` from 2025.12.1 to 2025.12.4
- [Release notes](https://github.com/scitools/workflows/releases)
- [Commits](SciTools/workflows@2025.12.1...2025.12.4)

---
updated-dependencies:
- dependency-name: scitools/workflows/.github/workflows/ci-manifest.yml
  dependency-version: 2025.12.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci-manifest.yml

@@ -24,4 +24,4 @@ concurrency:
 jobs:
   manifest:
     name: "check-manifest"
-    uses: scitools/workflows/.github/workflows/[email protected].1
+    uses: scitools/workflows/.github/workflows/[email protected].4