Fix monolog line parser to avoid breaking on json with [ and { combinations

[frankdekker]

MonologLineParser incorrectly parses:

[2025-06-17T17:12:21.132905+02:00] app.ERROR: Failed to validate token for user 1 with token 1d6fb7274892a4e8ba70647b399c3ff851e0932bea0ef362773e617c030f3c and hostname example.com. Message: An OAuth server error was encountered that did not contain a JSON body {"exception":"[object] (UnexpectedValueException(code: 0): An OAuth server error was encountered that did not contain a JSON body at /project/vendor/league/oauth2-client/src/Provider/AbstractProvider.php:800)\n[previous exception] [object] (UnexpectedValueException(code: 0): Failed to parse JSON response: Syntax error at /project/vendor/league/oauth2-client/src/Provider/AbstractProvider.php:752)"} {"trace_id":"77fa144951d279168cb94f6d127732a2","transaction_id":"1868aedc715fb740","memory_usage":"12 MB"}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7c399ae) to head (875b7c5).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #215   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       458       458           
===========================================
  Files             92        92           
  Lines           1245      1245           
===========================================
  Hits            1245      1245           

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