chore: update upload-artifact GH action

Author: edgurgel

.github/workflows/test.yaml

@@ -43,9 +43,10 @@ jobs:
           chown -R postgres /__w/walrus/walrus
           su postgres -c 'export PATH=$PATH:/usr/lib/postgresql/15/bin/ ; bin/installcheck'
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: regression.out
-          path: regression.out
+          name: regression.out-${{ matrix.runs-on }}
+          path: regression-${{ matrix.runs-on }}.out
           retention-days: 7