Remove deprecated spider argument from StatsCollector.inc_value() calls

[Copilot]

Scrapy deprecated passing a spider argument to StatsCollector.inc_value() and will remove it in a future version, causing ScrapyDeprecationWarning on every enqueue/dequeue operation.

Changes

• scheduler.py: Drop spider=self.spider from both inc_value calls:

  # Before
  self.stats.inc_value("scheduler/enqueued/redis", spider=self.spider)
  self.stats.inc_value("scheduler/dequeued/redis", spider=self.spider)
  
  # After
  self.stats.inc_value("scheduler/enqueued/redis")
  self.stats.inc_value("scheduler/dequeued/redis")

[Copilot]

Pull request overview

Removes deprecated spider keyword usage in StatsCollector.inc_value() calls to avoid ScrapyDeprecationWarning during Redis scheduler enqueue/dequeue operations.

Changes:

• Drop spider=self.spider from the scheduler/enqueued/redis stats increment.
• Drop spider=self.spider from the scheduler/dequeued/redis stats increment.

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