[camera,video_player] Update Android to 3.29 minimum (#9317)
This is a prequel to https://github.com/flutter/packages/pull/9316 to separate out auto-generated changes. All this does is:
- Set the minimum SDK version to 3.29.
- Run the autoformatter—which changes a ton of things because the 3.29 minimum opts into the new formatter.
## Pre-Review Checklist
[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.