[ci] Update actions/upload-artifact action to v6

Author: lpinca

.github/workflows/ci.yml

@@ -72,7 +72,7 @@ jobs:
           architecture: ${{ matrix.arch }}
       - run: npm install
       - run: npm run prebuild
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.os }}-${{ matrix.arch }}
           path: prebuilds