Compatibility with Symfony 6.x

[yann-eugone]

Reported in #33

[codecov]

Codecov Report

Merging #34 (e72ddeb) into main (ea912e9) will decrease coverage by 0.16%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main      #34      +/-   ##
============================================
- Coverage     91.13%   90.97%   -0.17%     
- Complexity       44       45       +1     
============================================
  Files             2        2              
  Lines           158      144      -14     
============================================
- Hits            144      131      -13     
+ Misses           14       13       -1     

Impacted Files	Coverage Δ
src/Controller/WorkflowControllerTrait.php	79.66% <100.00%> (-1.77%)	⬇️
src/Admin/Extension/WorkflowExtension.php	98.82% <0.00%> (-0.05%)	⬇️

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