cURL incompatibility with Kaspersky (kesl)

Summary

I'm facing an issue with some servers having kesl service (Kaspersky) installed and running.

Sometimes wp_remote_* calls fails with error:

Scaricamento del pacchetto di installazione da https://downloads.wordpress.org/plugin/jetpack.10.1.zip...
Warning: Il download non è andato a buon fine. "cURL error 18: transfer closed with 332690 bytes remaining to read"

The number of bytes is completely randomic.
Since it's not consistent, I've prepared this script to be run over and over (without wp-cli cache of course):

while :; do  wp plugin install jetpack && wp plugin delete jetpack && rm -rf /root/.wp-cli/cache/*; done

After digging a lot into WpOrg\Requests\Transport\cURL implementation I've found these lines being the cause of the issue:

<?php
// Force closing the connection for old versions of cURL (<7.22).
if (!isset($headers['Connection'])) {
        $headers['Connection'] = 'close';
}

Disabling these lines, the issue disappear. Why aren't we checking the cURL version here?
I would then suggest these changes:

1. Add a new const const CURL_7_22_0 = 0x071600
2. Check the version and add that header only if needed

Your environment

Tested against develop branch?

• I have verified the issue still exists in the develop branch of Requests.

Start at the WpOrg\Requests\Transport\cURL implementation used by wp_remote_* calls and inspect the Connection header logic alongside the available cURL version. Verify the behavior against the reported Kaspersky kesl transfer failure; done means the header is conditional for older cURL versions and the existing download path remains functional.