Add php file information

dev/core#4014 (comment 85180)

docs/general/requirements.md

@@ -101,6 +101,7 @@ To install these extensions, you will typically install a separate package withi
 * [PHP Multibyte](https://php.net/manual/en/ref.mbstring.php) - required for internationalisation and proper encoding of fields.
 * [PHP Zip](https://php.net/manual/en/book.zip.php) - required for unzipping auto-downloaded extensions so they can be installed from the browser.
 * [PHP INTL](https://www.php.net/intl) - required for outputting localized formatted number strings from CiviCRM 5.28 onwards
+* [PHP File Information](https://www.php.net/manual/en/book.fileinfo.php) - required for spreadsheet support from 5.44 onwards
 
 #### Required for Third-Party Functionality or CiviCRM Extensions