Bump GA upload-artifact to v4

Author: roji

.github/workflows/build.yml

@@ -160,7 +160,7 @@ jobs:
         run: dotnet pack --configuration Release --property:PackageOutputPath="$PWD/nupkgs" --version-suffix "ci.$(date -u +%Y%m%dT%H%M%S)+sha.${GITHUB_SHA:0:9}" -p:ContinuousIntegrationBuild=true
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: EFCore.PG.CI
           path: nupkgs