Buildkite pipeline for QuantumClifford

Bump dawidd6/action-download-artifact from 8 to 9

Failed in 23m 38s
Downstream Breakage CI on Buildkiteecho "Julia depot path ${JULIA_DEPOT_PATH}" && julia --project='~' -e ' using Pkg; pkg"dev .";' && julia --project='~' -e ' using Pkg; Pkg.add("QuantumSavory"); Pkg.build("QuantumSavory"); Pkg.test("QuantumSavory"); Pkg.add("BPGates"); Pkg.build("BPGates"); Pkg.test("BPGates");'
Waited 1s
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Ran in 13m 2s
Total Job Run Time: 36m 40s