Remove support for PHP8.3

Author: nyamsprod

src/Identifiers.php

@@ -74,7 +74,7 @@ public function __construct(Identifiers|HasIdentifiers|iterable|string $items =
     private static function filterIdentifiers(Identifiers|HasIdentifiers|iterable|string $data): array
     {
         if ($data instanceof HasIdentifiers) {
-            return $data->identifiers()->all();
+            return $data->identifiers->all();
         }
 
         if ($data instanceof self) {
@@ -159,7 +159,7 @@ public function isEmpty(): bool
     public function equals(HasIdentifiers|Identifiers $other): bool
     {
         $currentLabels = $this->items;
-        $otherLabels = $other instanceof HasIdentifiers ? $other->identifiers()->items : $other->items;
+        $otherLabels = $other instanceof HasIdentifiers ? $other->identifiers->items : $other->items;
 
         sort($currentLabels, SORT_STRING);
         sort($otherLabels, SORT_STRING);

src/LocaleTimeFormatter.php

@@ -4,7 +4,6 @@
 
 namespace Bakame\Tokei;
 
-use DateTimeImmutable;
 use DateTimeZone;
 use IntlDateFormatter;
 use Throwable;
@@ -50,14 +49,6 @@ private static function createFormatter(string $locale, LocaleVerbosity $verbosi
                 },
                 timezone: $timezone,
             );
-
-            // For PHP83 only we are required to test the instantiated instance to
-            // validate that it is in a valid state. An error is only thrown with
-            // the following message "Found unconstructed IntlDateFormatter"
-            // when format is called,
-            if (PHP_VERSION_ID < 80400) {
-                $formatter->format(new DateTimeImmutable());
-            }
         } catch (Throwable $exception) {
             throw new ValueError('Unable to instantiate '.self::class.'; verify the locale.', previous: $exception);
         }