use upload-pages-artifact v3.

Author: KtorZ

.github/workflows/continuous-integration.yml

@@ -30,7 +30,7 @@ jobs:
       - run: aiken check -D
       - run: aiken build
       - run: aiken docs -o docs
-      - uses: actions/upload-pages-artifact@v4
+      - uses: actions/upload-pages-artifact@v3
         with:
           path: "docs/"