Bump actions/upload-pages-artifact from 3 to 4 (#7)

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

Author: dependabot[bot]

.github/workflows/static.yml

@@ -35,7 +35,7 @@ jobs:
             echo "::warning title=Invalid file permissions automatically fixed::$line"
           done
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: 'target/doc/'
   deploy: