ci: don't add changelog entry for metrics Flutter SDK updates

[vaind]

fixes #1063 (review)

[codecov-commenter]

Codecov Report

Base: 90.45% // Head: 91.37% // Increases project coverage by +0.91% 🎉

Coverage data is based on head (0f66841) compared to base (633cf2e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1070      +/-   ##
==========================================
+ Coverage   90.45%   91.37%   +0.91%     
==========================================
  Files         114        9     -105     
  Lines        3584      197    -3387     
==========================================
- Hits         3242      180    -3062     
+ Misses        342       17     -325     

Impacted Files	Coverage Δ
dart/lib/src/transport/http_transport.dart
dart/lib/src/transport/encode.dart
dart/lib/src/protocol/sentry_transaction.dart
dart/lib/src/sentry_exception_factory.dart
dart/lib/src/transport/rate_limit_parser.dart
dart/lib/src/client_reports/client_report.dart
dart/lib/src/platform/_io_platform.dart
dart/lib/src/protocol/mechanism.dart
dart/lib/src/isolate_error_integration.dart
dart/lib/src/sentry_options.dart
... and 95 more

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