fix(ci): upload-pages-artifact@v4 does not exist

Author: robbielyman

.github/workflows/docs.yml

@@ -30,7 +30,7 @@ jobs:
           version: 0.14.0-dev.3259+0779e847f
       - run: make docs
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@v3
         with:
           path: 'zig-out/docs'
       - name: Deploy to GitHub Pages