Update material3-adaptive to 1.0.0-alpha03

[alexvanyo]

Updates material3-adaptive to 1.0.0-alpha03.

Currently, this doesn't work on smaller screens: tapping a list item appears to have no effect: https://issuetracker.google.com/issues/316376112

[IanGClifton]

LGTM though we may want to add a snippet for the MyItem class now that it has a Saver, but we'll need to update the DAC page shortly after.

[snippet-bot]

Here is the summary of changes.

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• compose/snippets/src/main/java/com/example/compose/snippets/adaptivelayouts/SampleListDetailPaneScaffold.kt:195, tag android_compose_adaptivelayouts_sample_list_detail_pane_scaffold_myitem

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[alexvanyo]

@IanGClifton this is ready for review now, I added a new section for MyItem in preparation for including it in the documentation page update.