chore(deps): update actions/upload-artifact action to v6 (#535)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -136,7 +136,7 @@ jobs:
 
       - name: Publish NuGet packages (fork)
         if: github.event.pull_request.head.repo.fork == true
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         with:
           name: nupkgs
           path: src/**/*.nupkg