Prefer https:// when fetching server's autoconfig/config-v1.1.xml
#39 (closed) implements the autoconfiguration mechanism used by Thunderbird and described at https://developer.mozilla.org/en-US/docs/Mozilla/Thunderbird/Autoconfiguration . The latter link says
https was added in June 2019 to the spec. Please use https whenever possible. Former versions of this spec defined http only. http is still supported for existing hosts and in order to support domain hosters. http is deprecated now, but will need to be supported until at least end of 2023 for both of these reasons.
Update Evolution to prefer https when fetching the autoconfig URL.