Bump scitools/workflows in the dependencies group

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


Updates `scitools/workflows` from 2025.03.8 to 2025.04.0
- [Release notes](https://github.com/scitools/workflows/releases)
- [Commits](SciTools/workflows@2025.03.8...2025.04.0)

---
updated-dependencies:
- dependency-name: scitools/workflows
  dependency-version: 2025.04.0
  dependency-type: direct:production
  dependency-group: dependencies
...

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

Author: dependabot[bot]

.github/workflows/ci-manifest.yml

@@ -25,4 +25,4 @@ concurrency:
 jobs:
   manifest:
     name: "check-manifest"
-    uses: scitools/workflows/.github/workflows/ci-manifest.yml@2025.03.8
+    uses: scitools/workflows/.github/workflows/ci-manifest.yml@2025.04.0