fixup! ci: run Scalar's Functional Tests

The Scalar Functional Tests run at
https://github.com/microsoft/git/actions/runs/13074318147 has been
automatically failed because it uses a deprecated version of
`actions/upload-artifact: v3`.

The error message suggested to learn more at:
https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

While we may very well soon decide to just stop running the Scalar
Functional Tests because basically all of the tests (except for
integration testing with the remote `gvfs/ci` repository) have
equivalent coverage in `microsoft/git`'s own test suite.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

.github/workflows/scalar-functional-tests.yml

@@ -203,7 +203,7 @@ jobs:
 
       - name: Archive Trace2 Logs
         if: ( success() || failure() ) && ( steps.trace2_zip_unix.conclusion == 'success' || steps.trace2_zip_windows.conclusion == 'success' )
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ env.TRACE2_BASENAME }}.zip
           path: scalar/${{ env.TRACE2_BASENAME }}.zip