Can't boot LUKS encrypted install after 2023-03-31 stable update

/dev/sda1 is wrong because it is in your USB stick, not your system.

Try to chroot to your system with your USB stick.

$ cryptsetup luksOpen /dev/nvme0n1p2 my_encypted_device
$ mount /dev/mapper/my_encypted_device    /mnt
$ mount /dev/nvme0n1p1 /mnt/boot/efi
$ manjaro-chroot /mnt
# nano /etc/default/grub

Edit GRUB config to follow:

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