Upgrade Symfony to 6.4.25 & other vendors, require PHP 8.3

[jmsche]

Hi @bastien70, it's been a long time :)

Small PR to upgrade Symfony to 6.4.25 for now & PHP 8.3.

Next PRs will upgrade the remaining dependencies (Symfony 7.3, ORM v3, Foundry, PHPUnit...) & use the new admin routes from EasyAdmin.

Also fixes #90 by the way :)

Cheers!

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 83.33333% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.56%. Comparing base (a93a30e) to head (be4c68f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Admin/Field/BadgeField.php	25.00%	3 Missing ⚠️
src/Entity/Embed/BackupTask.php	66.66%	1 Missing ⚠️
src/Repository/UserRepository.php	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##               main      #91      +/-   ##
============================================
- Coverage     83.69%   82.56%   -1.13%     
- Complexity      474      515      +41     
============================================
  Files            67       72       +5     
  Lines          1950     2117     +167     
============================================
+ Hits           1632     1748     +116     
- Misses          318      369      +51     

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