initfs: resizing root partition does not work for devices with cgpt

Describe your issue

What's the expected behaviour?

After doing pmbootstrap install, pmootstrap export and booting the image flashed to sd card, it is expected that rootfs will be resized

What's the current behaviour?

Nothing

What device are you using?

• google-snow
• google-peach-pit

How to reproduce your issue?

$ sudo parted /dev/sde
GNU Parted 3.4
Using /dev/sde
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) resizepart 3 100%                                                
Warning: Not all of the space available to /dev/sde appears to be used, you can
fix the GPT to use all of the space (an extra 12726272 blocks) or continue with
the current setting? 
Fix/Ignore? Fix                                                           
Partition number? 3                                                       
End?  [1226MB]? 100%                                                      
(parted)                                                                  

Information: You may need to update /etc/fstab.

After that, kernel partition on cgpt becomes unsuccessful.

When i chose Ignore, parted does nothing.

Additional information

• Images created with these scripts should be possible to resize - https://github.com/hexdump0815/imagebuilder/tree/main/scripts;
• Related initfs code - https://gitlab.com/postmarketOS/pmaports/-/blob/master/main/postmarketos-mkinitfs/init_functions.sh;
• initfs code should also be adjusted to use third partition instead of second.