Update the HTTP11DownloadHandler import path.

[wRAR]

This is for compatibility with the upcoming Scrapy 2.14 where the old path is deprecated.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b387b42) to head (2ddeede).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #356   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          633       633           
=========================================
  Hits           633       633           

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[elacuesta]

Thanks!