chore(deps): update Flutter SDK (metrics) to v3.7.7

[github-actions]

Bumps metrics/flutter.properties from 3.7.6 to 3.7.7.

Auto-generated by a dependency updater.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.67 ⚠️

Comparison is base (11fb408) 90.03% compared to head (a63ac24) 89.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1319      +/-   ##
==========================================
- Coverage   90.03%   89.37%   -0.67%     
==========================================
  Files         110       45      -65     
  Lines        3483     1581    -1902     
==========================================
- Hits         3136     1413    -1723     
+ Misses        347      168     -179     

Impacted Files	Coverage Δ
dart/lib/src/protocol/sentry_stack_trace.dart
...t_processor/enricher/enricher_event_processor.dart
...rt/lib/src/sentry_client_attachment_processor.dart
dart/lib/src/protocol/sentry_culture.dart
dart/lib/src/protocol/sentry_trace_header.dart
dart/lib/src/integration.dart
dart/lib/src/platform/platform.dart
dart/lib/src/protocol/sentry_user.dart
...ib/src/sentry_attachment/io_sentry_attachment.dart
dart/lib/src/utils/_io_get_isolate_name.dart
... and 145 more

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