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Clean up anaconda repository #560

Job	Run time
Clean up anaconda packages (dppy/dpcpp-llvm-spirv)	41s
Clean up anaconda packages (dppy/dpctl)	1m 8s
Clean up anaconda packages (dppy/dpbench)	1m 9s
Clean up anaconda packages (dppy/numba-dpex)	1m 9s
Clean up anaconda packages (dppy/dpnp)	48s
Clean up anaconda packages (dppy/numba-mlir)	42s
	5m 37s