Update LVGL to v9.1.0

lib/lvgl/.github/pull_request_template.md

@@ -2,7 +2,12 @@
 
 A clear and concise description of what the bug or new feature is.
 
-### Checkpoints
-- [ ] Follow the [styling guide](https://github.com/lvgl/lvgl/blob/master/docs/CODING_STYLE.md)
-- [ ] Run `code-format.py` from the `scripts` folder. [astyle](http://astyle.sourceforge.net/install.html) needs to be installed.
-- [ ] Update the documentation
+### Notes
+- Update the [Documentation](https://github.com/lvgl/lvgl/tree/master/docs) if needed.
+- Add [Examples](https://github.com/lvgl/lvgl/tree/master/examples) if relevant.
+- Add [Tests](https://github.com/lvgl/lvgl/blob/master/tests/README.md) if applicable.
+- If you added new options to `lv_conf_template.h` run [lv_conf_internal_gen.py](https://github.com/lvgl/lvgl/blob/master/scripts/lv_conf_internal_gen.py) and update [Kconfig](https://github.com/lvgl/lvgl/blob/master/Kconfig).
+- Run `scripts/code-format.py` ([astyle](http://astyle.sourceforge.net/install.html) version [v3.4.10](https://github.com/szepeviktor/astyle/releases/tag/v3.4.10) needs to be installed) and follow the [Code Conventions](https://docs.lvgl.io/master/CODING_STYLE.html).
+- Mark the Pull request as [Draft](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/changing-the-stage-of-a-pull-request) while you are working on the first version, and mark is as _Ready_ when it's ready for review.
+- When changes were requested, [re-request review](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/requesting-a-pull-request-review) to notify the maintainers.
+- Help us to review this Pull Request! Anyone can [approve or request changes](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/approving-a-pull-request-with-required-reviews).