fix: php 8.4 deprecation for implicitly nullable parameters (#219)

Author: david-zelty

src/LaunchDarkly/EvaluationReason.php

@@ -166,7 +166,7 @@ private function __construct(
         ?string $ruleId = null,
         ?string $prerequisiteKey = null,
         bool $inExperiment = false,
-        BigSegmentsEvaluationStatus $bigSegmentsEvaluationStatus = null
+        ?BigSegmentsEvaluationStatus $bigSegmentsEvaluationStatus = null
     ) {
         $this->_kind = $kind;
         $this->_errorKind = $errorKind;

src/LaunchDarkly/Impl/Evaluation/EvalResult.php

@@ -22,7 +22,7 @@ class EvalResult
      * @param EvaluationDetail $detail
      * @param bool $forceReasonTracking
      */
-    public function __construct(EvaluationDetail $detail, bool $forceReasonTracking = false, EvaluatorState $state = null)
+    public function __construct(EvaluationDetail $detail, bool $forceReasonTracking = false, ?EvaluatorState $state = null)
     {
         $this->_detail = $detail;
         $this->_state = $state;