Bump actions/upload-artifact from 4 to 7

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

---
updated-dependencies:
- dependency-name: actions/upload-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

@@ -38,7 +38,7 @@ jobs:
       run: make install
 
     - name: Upload
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v7
       with:
         name: mdspan
         path: mdspan-install
@@ -77,7 +77,7 @@ jobs:
       run: tar -cvf stdblas.tar *
 
     - name: Upload workspace
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v7
       with:
         name: stdblas
         path: stdblas.tar