Bump actions/upload-pages-artifact from 3 to 4 (#40)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/publish-pages.yml

@@ -46,7 +46,7 @@ jobs:
           out-file-path: output/firmware
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: output
           retention-days: 1