use esc_html for API response output instead of FILTER_SANITIZE_STRING #123
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FILTER_SANITIZE_STRINGis deprecated as of PHP 8.1 and raises a warning when used. This only occurs in case of error responses from the API here.For all other parts of the mail body we use some kind of HTML escaping, so let's migrate the sanitization to
esc_html()here, too.