Fix phpstan error in Fetch class

[VerifiedJoseph]

Fixes type error in use of curl_setopt_array

Line   backend/include/Fetch.php                                                                                                                                              
 ------ ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- 
  :38    Parameter #2 $options of function curl_setopt_array expects array{19913: bool, 52: bool, 10018: non-empty-string}, array{19913: true, 52: true, 10018: string} given.  
         🪪  argument.type                                                                                                                                                      
         💡  Offset 10018 (non-empty-string) does not accept type string.   

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (636f249) to head (4cbd84e).
⚠️ Report is 9 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##                main      #938   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       276       276           
===========================================
  Files             38        38           
  Lines            938       917   -21     
===========================================
- Hits             938       917   -21     

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