Update submodule public_regulated_data_types to latest Sat May 7 00:3…

…9:40 UTC 2022

    - public_regulated_data_types in PX4/Firmware (4fbc9ca): OpenCyphal/public_regulated_data_types@0a773b9
    - public_regulated_data_types current upstream: OpenCyphal/public_regulated_data_types@70573cb
    - Changes: OpenCyphal/public_regulated_data_types@0a773b9...70573cb

    70573cb 2022-05-06 Pavel Kirienko - Automatic extension change & Cyphalization (#127)
d0bd651 2022-04-09 Pavel Kirienko - Update branding
1565632 2021-10-15 Pavel Kirienko - Replace DS-015 with UDRAL (#125)
b02e689 2021-09-11 Pavel Kirienko - Add status badge
addb060 2021-09-11 Kalyan Sriram - ci: switch to github actions (#122)