Work Around PHPCompatibility Bug

src/PhpSpreadsheet/Style/NumberFormat/Wizard/CurrencyNegative.php

@@ -4,11 +4,17 @@ namespace PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard;
 
 enum CurrencyNegative
 {
+    // PHPCompatibility (versions check) has an error which
+    // causes it to flag the use of $this below as erroneous.
+    // They fixed it in their development branch in October 2022.
+    // But they haven't had a release since 2019!
+    // Hence the phpcs disable statment below.
     case minus;
     case redMinus;
     case parentheses;
     case redParentheses;
 
+    // phpcs:disable PHPCompatibility.Variables.ForbiddenThisUseContexts
     public function start(): string
     {
         return match ($this) {
@@ -32,4 +38,5 @@ enum CurrencyNegative
             self::parentheses, self::minus => '',
         };
     }
+    // phpcs:enable
 }