chore: symfony/phpunit-bridge version constraint & dependabot grouping

[DjordyKoert]

Description

Replaces #2459 & adds symfony & phpstan grouping for depandabot

What type of PR is this? (check all applicable)

• Bug Fix
• Feature
• Refactor
• Deprecation
• Breaking Change
• Documentation Update
• CI

Checklist

• I have made corresponding changes to the documentation (docs/)
• I have made corresponding changes to the changelog (CHANGELOG.md)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.88%. Comparing base (90151a2) to head (50e0e84).
Report is 1 commits behind head on 5.x.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##              5.x    #2460   +/-   ##
=======================================
  Coverage   95.88%   95.88%           
=======================================
  Files          88       88           
  Lines        2770     2770           
=======================================
  Hits         2656     2656           
  Misses        114      114           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.