remove custom added "<?php\n" for php 8.3

[mixxael]

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

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.85%. Comparing base (16f5062) to head (afa0aab).

Files with missing lines	Patch %	Lines
framework/helpers/BaseVarDumper.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #20344   +/-   ##
=========================================
  Coverage     64.85%   64.85%           
  Complexity    11437    11437           
=========================================
  Files           431      431           
  Lines         37199    37199           
=========================================
  Hits          24125    24125           
  Misses        13074    13074           

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[xepozz]

https://3v4l.org/gABFK

Looks valid

[xepozz]

@mixxael could you also add a test?

<=8.2 – <br>
>=8.3 – \n