Thanks @romasha89 for the info but I dont think the mysql version is causing this kind of errors. I do think that @mattwire has a valid point as the SqlDataFlow class uses a parameter to a CiviCRM core function \CRM_Core_DAO::executeQuery which is deprecated since recently.
I am getting these in version 1.36 on CiviCRM 5.36.1.
Deprecated function: Non-static method CRM_DataprocessorSearch_Utils_PrevNextCache::getSelection() should not be called statically in CRM_DataprocessorSearch_Form_AbstractSearch->getSelectedIds() (line 562 of sites/default/files/civicrm/ext/dataprocessor/CRM/DataprocessorSearch/Form/AbstractSearch.php).
Deprecated function: Non-static method CRM_DataprocessorSearch_Utils_PrevNextCache::deleteItem() should not be called statically in CRM_DataprocessorSearch_Form_AbstractSearch->postProcess() (line 505 of sites/default/files/civicrm/ext/dataprocessor/CRM/DataprocessorSearch/Form/AbstractSearch.php).