Reverts flutter/engine#47609 Initiated by: zanderso This change reverts the following previous change: Original Description: ~**This should not land until https://github.com/flutter/buildroot/pull/790 (re)lands, and I swap the buildroot url back to the latest commit.**~ ~Reland of PR to update buildroot at https://github.com/flutter/buildroot/pull/792. ~ <- landed, and changed the buildroot commit to the latest in DEPS Upgrades to android api 34 Also: 1. Upgrades to java 17 in DEPS/ci, because the linter now requires it. 2. Stops running some roboelectric tests on android apis 16-18, because Roboelectric indicated those versions were unsupported and we don't support them either. 3. Applies the four trivial new suggestions from the newer linter. 4. Updates the baseline lint to include the new non-trivial lint ([fixed in a different PR](https://github.com/flutter/engine/pull/47817/files)). 5. Changes some instances where we were hardcoding android apis as numbers (e.g. `sdk = 16') to use version codes (see the [comment below](https://github.com/flutter/engine/pull/47609#issuecomment-1800308658)). [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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