[material_ui] Undo relaxed constraints

[Piinks]

Updates the constraints on material_ui
They were relaxed earlier today to work around a major release issue.
Context: https://gist.github.com/Piinks/cd1f02160ed674b7a7708b18836e2fd4

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[flutter-dashboard]

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[gemini-code-assist]

Code Review

This pull request updates the cupertino_ui dependency constraint to ^1.0.0 in packages/material_ui/pubspec.yaml and its example pubspec.yaml. Additionally, a pending changelog entry is added to document this change. There are no review comments, and I have no feedback to provide.

[justinmc]

LGTM 👍

[auto-submit]

autosubmit label was removed for flutter/packages/12451, because - The status or check suite Dashboard Checks has failed. Please fix the issues identified (or deflake) before re-applying this label.