test(portugal): fix official holidays tests

The Restoration of Independence Day was considered to be observed at any
time, however it is only observed between 1850 and 2012, and since 2016.

Signed-off-by: Sacha Telgenhof <me@sachatelgenhof.com>

tests/Portugal/PortugalTest.php

@@ -54,7 +54,6 @@ public function testOfficialHolidays(): void
             'immaculateConception',
             'christmasDay',
             '25thApril',
-            'restorationOfIndependence',
             'portugalDay',
         ];
 
@@ -66,6 +65,10 @@ public function testOfficialHolidays(): void
             $holidays[] = 'portugueseRepublic';
         }
 
+        if (($this->year >= 1850 && $this->year <= 2012) || $this->year >= 2016) {
+            $holidays[] = 'restorationOfIndependence';
+        }
+
         $this->assertDefinedHolidays($holidays, self::REGION, $this->year, Holiday::TYPE_OFFICIAL);
     }