test: fix official holidays tests for Portugal

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);
     }