Change mirror urls on the backport PR

...gitlab/cloud_pipelines/stacks/aws-ahug-aarch64/spack.yaml

...e/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml

.../gitlab/cloud_pipelines/stacks/aws-isc-aarch64/spack.yaml

share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml

...ck/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml

...ack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml

...spack/gitlab/cloud_pipelines/stacks/deprecated/spack.yaml

share/spack/gitlab/cloud_pipelines/stacks/e4s-mac/spack.yaml

...spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml

.../spack/gitlab/cloud_pipelines/stacks/e4s-power/spack.yaml

share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml

.../spack/gitlab/cloud_pipelines/stacks/gpu-tests/spack.yaml

...lab/cloud_pipelines/stacks/ml-linux-x86_64-cpu/spack.yaml

...ab/cloud_pipelines/stacks/ml-linux-x86_64-cuda/spack.yaml

...ab/cloud_pipelines/stacks/ml-linux-x86_64-rocm/spack.yaml

...lab/cloud_pipelines/stacks/radiuss-aws-aarch64/spack.yaml

...pack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml

share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml

...e/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml