Update y iisoft/yii2-symfonymailer to 4.0.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a858218) 18.35% compared to head (7aa3d1e) 18.35%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #21   +/-   ##
=========================================
  Coverage     18.35%   18.35%           
  Complexity      609      609           
=========================================
  Files            78       78           
  Lines          3546     3546           
=========================================
  Hits            651      651           
  Misses         2895     2895           

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