SUMIFS Does Not Require _xlfn

Fix #4182. It was on our list as "introduced in 2019". It was, in fact, available with Excel 2007 (https://support.microsoft.com/en-us/office/excel-functions-alphabetical-b3944572-255d-4efb-bb96-c6d90033e188#bm19), so does not require a prefix when writing it to a spreadsheet.

src/PhpSpreadsheet/Writer/Xlsx/FunctionPrefix.php

@@ -130,7 +130,6 @@ class FunctionPrefix
         . '|ifs'
         . '|maxifs'
         . '|minifs'
-        . '|sumifs'
         . '|textjoin'
         // functions added with Excel 365
         . '|anchorarray'

tests/PhpSpreadsheetTests/Writer/Xlsx/FunctionPrefixTest.php

@@ -37,6 +37,7 @@ class FunctionPrefixTest extends TestCase
             'DAYS/NETWORKDAYS 4' => ['ABS(_xlfn.DAYS(DATE(2023,1,1),TODAY()))', 'ABS(_xlfn.DAYS(DATE(2023,1,1),TODAY()))'],
             'DAYS/NETWORKDAYS 5' => ['NETWORKDAYS(DATE(2023,1,1),TODAY(), C:C)', 'NETWORKDAYS(DATE(2023,1,1),TODAY(), C:C)'],
             'COUNTIFS reclassified as Legacy' => ['COUNTIFS()', 'COUNTIFS()'],
+            'SUMIFS reclassified as Legacy' => ['SUMIFS()', 'SUMIFS()'],
         ];
     }
 }