[dart-announce] Breaking change 56468: Mark IOOverrides as base

['Ben Konyi' via Dart Announcements]

The IOOverrides class specifies the default behavior of several dart:io APIs and can be extended by developers to override the default behavior (e.g., for testing).

Since this class provides default implementations for each overridable API and allowing for developers to implement IOOverrides means changing the interface is always a breaking change, issue 56468 proposes that IOOverrides should be marked as a base class, meaning it can only be extended and not implemented.

If you have any thoughts or concerns, please leave your feedback on https://github.com/dart-lang/sdk/issues/56468. 

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