Cs fixer 8 4

[aldas]

With 8.4 PHPStan complains about https://wiki.php.net/rfc/deprecate-implicitly-nullable-types this PR fixes these

Fixer is run with

sudo docker run -it --rm -v $(pwd):/code ghcr.io/php-cs-fixer/php-cs-fixer:${FIXER_VERSION:-3-php8.3} fix --rules nullable_type_declaration_for_default_null_value src

PHPStan can be run with

sudo docker run -it --rm -v .:/code  php:8.4.1-zts-bookworm /bin/sh -c cd /code && vendor/bin/phpstan analyse --no-progres

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.93617% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.97%. Comparing base (b18323b) to head (2960eb4).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Utils/Charset.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #166   +/-   ##
=========================================
  Coverage     98.96%   98.97%           
  Complexity      936      936           
=========================================
  Files            73       73           
  Lines          2426     2429    +3     
=========================================
+ Hits           2401     2404    +3     
  Misses           25       25           

Flag	Coverage Δ
unittests	98.97% <98.93%> (+<0.01%)	⬆️

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