CVE-2023-23914: curl HSTS ignored on multiple requests

## Summary: curl tool HSTS doesn't work correctly when performing multiple requests within a single invocation. ## Steps To Reproduce: 1. `curl --hsts "" https://hsts.example.com http://hsts.example.com` The second request will be performed over HTTP regardless if correct HSTS header is returned by the first request. ## Impact Request performed over insecure channels unexpectedly and loss of confidentiality and integrity.