PCI hotplug test for aarch64 fails due to broken Debian installer URL

Host environment

Test suite failure, occurs in QEMU's CI environment and reproduces when run locally.

Emulated/Virtualized environment

N/A

Description of problem

The functional-system-opensuse test is failing:

qemu_test.asset.AssetError: https://ftp.debian.org/debian/dists/stable/main/installer-arm64/20230607+deb12u11/images/netboot/debian-installer/arm64/linux: Unable to download: HTTP error 404

Steps to reproduce

  1. Run functional-system-opensuse in QEMU's test suite

Additional information