fix: Update type declarations to use float instead of int

Update the type declarations in the `proportional` methods of `Exclusive.php` and `Inclusive.php` files to use float instead of int for the `$percentage` parameter. This ensures more accurate calculations for tax percentages.

Author: vaened

src/Adjustments/Taxation/Exclusive.php

@@ -14,7 +14,7 @@
 
 final class Exclusive extends TaxScheme
 {
-    public static function proportional(int $percentage, BackedEnum|UnitEnum|string $code): self
+    public static function proportional(float $percentage, BackedEnum|UnitEnum|string $code): self
     {
         return new self(AdjustmentType::Percentage, $percentage, AdjustmentMode::PerUnit, $code);
     }

src/Adjustments/Taxation/Inclusive.php

@@ -14,7 +14,7 @@
 
 final class Inclusive extends TaxScheme
 {
-    public static function proportional(int $percentage, BackedEnum|UnitEnum|string $code): self
+    public static function proportional(float $percentage, BackedEnum|UnitEnum|string $code): self
     {
         return new self(AdjustmentType::Percentage, $percentage, AdjustmentMode::PerUnit, $code);
     }

src/Helper.php

@@ -23,7 +23,7 @@ public static function processEnumerableCode(BackedEnum|UnitEnum|string|null $co
         };
     }
 
-    public static function percentageize(int $percentage): float
+    public static function percentageize(float $percentage): float
     {
         return $percentage / 100;
     }