Make the old session clean-up method timezone aware

[sanderdlm]

Type

• Non critical bugfix

Resolves the following issues

/

Pull request description

This fixes a bug where the database timezone would be different from
UTC, and the date inserted into the database would be incorrectly removed
by the NOW() check.

[codecov]

Codecov Report

Merging #3511 (5bd1cbc) into master (9e95d69) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #3511   +/-   ##
=========================================
  Coverage     27.87%   27.87%           
  Complexity     8150     8150           
=========================================
  Files           575      575           
  Lines         30705    30706    +1     
=========================================
+ Hits           8559     8560    +1     
  Misses        22146    22146           

Flag	Coverage Δ
functional	23.78% <100.00%> (+<0.01%)	⬆️
installer	3.84% <0.00%> (-0.01%)	⬇️
unit	7.69% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Backend/Core/Engine/Authentication.php	90.44% <100.00%> (+0.07%)	⬆️

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