debian10 fail to build: E: The repository 'http://deb.debian.org/debian buster-backports Release' does not have a Release file

[xin053]

github action log: https://github.com/xin053/actions/actions/runs/8847058782/job/24294127557

==> cloudimg.image.qemu.cloudimg: Provisioning with shell script: ./scripts/essential-packages.sh
[43](https://github.com/xin053/actions/actions/runs/8847058782/job/24294127557#step:7:44)
==> cloudimg.image.qemu.cloudimg: + export DEBIAN_FRONTEND=noninteractive
==> cloudimg.image.qemu.cloudimg: + DEBIAN_FRONTEND=noninteractive
==> cloudimg.image.qemu.cloudimg: + packer_apt_proxy_config=/etc/apt/apt.conf.d/packer-proxy.conf
==> cloudimg.image.qemu.cloudimg: + '[' '!' -z '' ']'
47
==> cloudimg.image.qemu.cloudimg: + '[' '!' -z '' ']'
48
==> cloudimg.image.qemu.cloudimg: ++ dpkg --print-architecture
49
==> cloudimg.image.qemu.cloudimg: + ARCH=amd64
==> cloudimg.image.qemu.cloudimg: + apt-get update
51
    cloudimg.image.qemu.cloudimg: Get:1 http://security.debian.org/debian-security buster/updates InRelease [34.8 kB]
52
    cloudimg.image.qemu.cloudimg: Get:2 http://deb.debian.org/debian buster InRelease [122 kB]
    cloudimg.image.qemu.cloudimg: Get:3 http://deb.debian.org/debian buster-updates InRelease [56.6 kB]
    cloudimg.image.qemu.cloudimg: Ign:4 http://deb.debian.org/debian buster-backports InRelease
    cloudimg.image.qemu.cloudimg: Err:5 http://deb.debian.org/debian buster-backports Release
    cloudimg.image.qemu.cloudimg:   404  Not Found [IP: 151.101.202.132 80]
    cloudimg.image.qemu.cloudimg: Get:6 http://security.debian.org/debian-security buster/updates/main Sources [377 kB]
    cloudimg.image.qemu.cloudimg: Get:7 http://security.debian.org/debian-security buster/updates/main amd64 Packages [596 kB]
    cloudimg.image.qemu.cloudimg: Get:8 http://security.debian.org/debian-security buster/updates/main Translation-en [323 kB]
    cloudimg.image.qemu.cloudimg: Get:9 http://deb.debian.org/debian buster/main Sources [7852 kB]
    cloudimg.image.qemu.cloudimg: Get:10 http://deb.debian.org/debian buster/main amd64 Packages [7909 kB]
    cloudimg.image.qemu.cloudimg: Get:11 http://deb.debian.org/debian buster/main Translation-en [5969 kB]
    cloudimg.image.qemu.cloudimg: Get:12 http://deb.debian.org/debian buster-updates/main Sources [[46](https://github.com/xin053/actions/actions/runs/8847058782/job/24294127557#step:7:47)16 B]
    cloudimg.image.qemu.cloudimg: Get:13 http://deb.debian.org/debian buster-updates/main amd64 Packages [8788 B]
    cloudimg.image.qemu.cloudimg: Get:14 http://deb.debian.org/debian buster-updates/main Translation-en [6915 B]
    cloudimg.image.qemu.cloudimg: Reading package lists...
==> cloudimg.image.qemu.cloudimg: E: The repository 'http://deb.debian.org/debian buster-backports Release' does not have a Release file.
==> cloudimg.image.qemu.cloudimg: Provisioning step had errors: Running the cleanup provisioner, if present...
==> cloudimg.image.qemu.cloudimg: Deleting output directory...
Build 'cloudimg.image.qemu.cloudimg' errored after 1 minute 3 seconds: Script exited with non-zero exit status: 100. Allowed exit codes are: [0]

==> Wait completed after 1 minute 3 seconds

==> Some builds didn't complete successfully and had errors:
--> cloudimg.image.qemu.cloudimg: Script exited with non-zero exit status: 100. Allowed exit codes are: [0]

==> Builds finished. The artifacts of successful builds are:
--> cloudimg.deps.null.dependencies: Did not export anything. This is the null builder
make: *** [Makefile:46: debian] Error 1
Error: Process completed with exit code 2.