fix(ci): upload-pages-artifact use v3

Signed-off-by: hndrk <[email protected]>

Author: hendriknielaender

.github/workflows/deploy-docs.yml

@@ -16,7 +16,7 @@ jobs:
       - run: zig build docs
 
       - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ./zig-out/docs