Clean up anaconda repository #511

Job	Run time
Clean up anaconda packages (dppy/dpcpp-llvm-spirv)	52s
Clean up anaconda packages (dppy/dpctl)	1m 5s
Clean up anaconda packages (dppy/dpnp)	51s
Clean up anaconda packages (dppy/dpbench)	1m 3s
Clean up anaconda packages (dppy/numba-mlir)	1m 0s
Clean up anaconda packages (dppy/numba-dpex)	47s
	5m 38s

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