fix(ci): use the dev branch of PlatformIO

[kisvegabor]

Description of the feature or fix

It should fix the issue of publishing new package.

cc @ivankravets

Notes

• Update the Documentation if needed.
• Add Examples if relevant.
• Add Tests if applicable.
• If you added new options to lv_conf_template.h run lv_conf_internal_gen.py and update Kconfig.
• Run scripts/code-format.py (astyle needs to be installed) and follow the Code Conventions
• Mark the Pull request as Draft 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 to notify the maintainers.
• Help us to review this Pull Request! Anyone can approve or request changes.

[kisvegabor]

I couldn't trigger the workflow manually, but using pio upgrade --dev I could publish LVGL v9 from command line. 🎉