Remove Symfony 5 support

[HypeMC]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.21%. Comparing base (a7338a8) to head (7571590).
⚠️ Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #128      +/-   ##
============================================
- Coverage     97.23%   97.21%   -0.02%     
+ Complexity      491      484       -7     
============================================
  Files            62       62              
  Lines          1373     1366       -7     
============================================
- Hits           1335     1328       -7     
  Misses           38       38              

Flag	Coverage Δ
8.1	97.21% <100.00%> (-0.02%)	⬇️
8.2	97.14% <100.00%> (-0.02%)	⬇️
8.3	96.92% <100.00%> (-0.02%)	⬇️
8.4	96.92% <100.00%> (-0.02%)	⬇️
8.5	96.92% <100.00%> (-0.02%)	⬇️

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