Clean up anaconda repository #369

Job	Run time
Clean up anaconda packages (dppy/dpcpp-llvm-spirv)	56s
Clean up anaconda packages (dppy/dpnp)	1m 12s
Clean up anaconda packages (dppy/dpctl)	1m 11s
Clean up anaconda packages (dppy/numba-dpex)	1m 9s
Clean up anaconda packages (dppy/dpbench)	1m 0s
Clean up anaconda packages (dppy/numba-mlir)	1m 9s
	6m 37s

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