chore: allow symfony 6

[darthf1]

resolves #373

Not sure if more needs to be done.

[codecov]

Codecov Report

Merging #374 (52bee08) into main (da1bb94) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #374   +/-   ##
=========================================
  Coverage     99.58%   99.58%           
  Complexity      360      360           
=========================================
  Files            20       20           
  Lines           964      964           
=========================================
  Hits            960      960           
  Misses            4        4           

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[ankitpokhrel]

Hi @darthf1, Thank you so much for the PR. I did a bit of sanity testing and things seems to be working as expected.

I will make a new release possibly next week if there are no complaints. Meanwhile, you can use 2.1-devfor latest changes.