Add php 8.5 to test pipeline

[marein]

Additional tasks to do:

• The default http client requires a change.
  $http_response_header is deprecated. To avoid deprecation warnings, the code should check if http_get_last_response_headers exists and use it instead of $http_response_header.

The following branches are affected:

• v3.0 + new release
  Add php 8.5 to test pipeline for ^3.0 #31
• master + new release
  Add php 8.5 to test pipeline #32