Bump actions/download-artifact from 4 to 7

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/cmake.yml

@@ -49,7 +49,7 @@ jobs:
 
     steps:
     - name: Download mdspan
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v7
       with:
         name: mdspan
         path: mdspan-install 
@@ -89,7 +89,7 @@ jobs:
     steps:
 
     - name: Download workspace
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v7
       with:
         name: stdblas
         path: .