[ci] increase muffet buffer size for dead link testing of docs (#3627)

tools/ci/check_for_website_dead_links.sh

@@ -46,6 +46,7 @@ if [ "$?" -eq "0" ];
           |http://demo.gethue.com*|https://twitter.com/gethue|https://github.com*|https://cdn.gethue.com/downloads/*|https://pypi.org*" \
         --ignore-fragments \
         --timeout 15 \
+        --buffer-size 8192 \
         --concurrency 10
     LINT_EXIT_CODE=$?