PHP8.3 style overrides added

src/FactorGraphs/ScheduleLoop.php

@@ -10,6 +10,7 @@ class ScheduleLoop extends Schedule
     {
     }
 
+    #[\Override]
     public function visit(int $depth = -1, int $maxDepth = 0): float
     {
         $delta = $this->scheduleToLoop->visit($depth + 1, $maxDepth);

src/FactorGraphs/ScheduleSequence.php

@@ -13,6 +13,7 @@ class ScheduleSequence extends Schedule
     {
     }
 
+    #[\Override]
     public function visit(int $depth = -1, int $maxDepth = 0): float
     {
         $maxDelta = 0;

src/FactorGraphs/ScheduleStep.php

@@ -10,6 +10,7 @@ class ScheduleStep extends Schedule
     {
     }
 
+    #[\Override]
     public function visit(int $depth = -1, int $maxDepth = 0): float
     {
         return $this->factor->updateMessageIndex($this->index);