check SSL Labs grade: Migrate to the Qualys SSL Labs v4 API

[Kjunix]

Is your feature request related to a problem? Please describe.

The Qualys SSL Labs v3 API is deprecated since end of 2023: https://notifications.qualys.com/api/2023/09/28/introduction-of-api-v4-for-qualys-ssllabs-and-deprecation-of-api-v3

Describe the solution you'd like

The Qualys SSL Labs v4 API should be used instead: https://github.com/ssllabs/ssllabs-scan/blob/master/ssllabs-api-docs-v4.md

Describe alternatives you've considered

Additional context

The v4 API requires registration of an e-mail address. The registered e-mail address must be passed to the analyze method. In consequence check_ssl_cert will require a registered e-mail address as a new parameter.

[matteocorti]

Thanks. I'll take a look as soon as possible.

[Kjunix]

For a soft migration and for downwards compatibility check_ssl_cert could use the V4 API if the registration e-mail address is passed and fall back to the V3 API if this not the case (and issue a deprecation warning)