build: bump actions/upload-artifact to v4.6.0 (#32649)

Author: sebastian-alfers

.github/workflows/nightly-builds.yml

@@ -145,7 +145,7 @@ jobs:
 
       # Archive test results so we can do some diagnostics later
       - name: Upload test results
-        uses: actions/upload-artifact@v3.1.1
+        uses: actions/upload-artifact@v4.6.0
         if: success() || failure()        # run this step even if previous step failed
         with:
           name: 'test-results-${{ matrix.jdkVersion }}-${{ matrix.scalaVersion }}'