Coroutine handler for engine_started signal

[elacuesta]

2026-01-19 12:01:23 [py.warnings] WARNING: /.../lib/python3.12/site-packages/scrapy/utils/signal.py:185: ScrapyDeprecationWarning: scrapy_playwright.handler.ScrapyPlaywrightDownloadHandler._engine_started returned a Deferred, this is deprecated. Please refactor this function to return a coroutine.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.89%. Comparing base (1ade940) to head (b54fc46).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #360   +/-   ##
=======================================
  Coverage   94.89%   94.89%           
=======================================
  Files           6        6           
  Lines         646      647    +1     
=======================================
+ Hits          613      614    +1     
  Misses         33       33           

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