It looks like you may be having an issue with your network connection. You can try running the command with the --connect-timeout flag to increase the timeout limit. For example:
curl --connect-timeout 300 -s https://laravel.build/example-app | bash
This will increase the timeout limit to 300 seconds. If that doesn't work, you can try running the command with the --insecure flag to ignore any SSL errors. For example:
curl --insecure -s https://laravel.build/example-app | bash
If that still doesn't work, you can try running the command with the --proxy flag to use a proxy server. For example:
curl --proxy http://proxy.example.com:8080 -s https://laravel.build/example-app | bash
If none of these solutions work, you may need to check your network connection or contact your network administrator.