Greg Spencer 301577a34f
Fixing a memory leak in About box/dialog overlays (#130842)
## Description

Fix three memory leaks detected by `about_test.dart`, but were really in the `Route` and `OverlayEntry` classes.

## Related Issues
 - Fixes https://github.com/flutter/flutter/issues/130354

## Tests
 - Updates about_test.dart to not ignore the leaks anymore.
2023-08-15 21:58:21 +00:00
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