[stable] [ dart:io ] Fix bad type casts in network_profiling.dart Issue description: In 32e45cf30031dd2466eaedbf5d98c457eff1bb61, types were updated from Map<String, dynamic> to Map<String, Object> in some situations. These two aren't compatible and can lead to runtime type cast failures. What is the fix: update changes from Map<String, Object> to Map<String, Object?> Why cherry-pick: this can cause network profiling to stop working seemingly randomly in DevTools. Risk: Low, tests added to verify original behavior and validate fix Issue link: https://github.com/dart-lang/sdk/issues/63156 CoreLibraryReviewExempt: Only internal dart:io details. Cherry-pick: https://dart-review.googlesource.com/c/sdk/+/494680 Change-Id: I350cd6a504daf282da112a28aec1c406c039ec56 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/494960 Reviewed-by: Elliott Brooks <elliottbrooks@google.com> Reviewed-by: Nate Biggs <natebiggs@google.com>
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