v0.5.6

First latest release since 0.5.4, so upgrading from latest also brings in
everything in 0.5.5, including the Bun >= 1.4.3 minimum.

Fixed

• arm64 machines find UEFI firmware that lives beside the QEMU quickchr runs,
  not only at the standard install paths. When no standard path has it,
  quickchr asks qemu-system-aarch64 -L help for that QEMU's data dirs and
  looks for the same firmware layouts there. A QEMU installed under another
  prefix, or relocated by a wrapper that passes -L, no longer fails with
  MISSING_FIRMWARE. (#254)