Updated deprecated upload-artifact action

Author: BlastWind

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
     - name: Build
       run: mdbook build
     # share between different jobs
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: book
         path: book/